"Vermin" by crowphoenix
Brace yo'self crow!
"He picked up the gun..." Man, that's a monster of a first sentence. Kind of has the same problem mine did--too many disconnected thoughts tied together by connective punctuation. You might just stop the sentence after "reloaded slowly" and let the next thought get its own sentence. "he slid the shells" probably don't need 'the.'
"Corpses lay across Lombard Street" Good imagery, but I'm picturing
this, and I don't think that was your intent.

"the bus lay, scattered like a grotesque offering..." This parses oddly. I think you mean the bodies are the grotesque offering, but the description attaches to the bus due to proximity. Might just make it plural: 'scattered like grotesque offerings'. "A group of six..." Six corpses? Buses? Either a paragraph break or a more descriptive word would help here. "the door to the bus slide open." Typo.
"What little light there was..." This whole paragraph breaks the tight 3rd I was expecting (i.e. who's seeing these wearied lines? To whom does his hair "seem to sprout"?). That's a valid choice to make, but it sticks out as odd to me.
"Evening, ladies" through "he drove the blade..." Excellent. Moves the action along while telling us a little about what's going on, and gives us insight into Noah (and his way of speaking

). Would have liked to see him draw his knife somewhere along the way.
"Splattering his face" only his face? Seems like it would've gone all over. "Splattering him in gore" would be fine. "His nose was too full of rot to notice anything." Awkward wording--your nose can't really notice anything. 'Detect', maybe?
"A harsh question in his eyes." Doesn't feel quite right. Could he... I dunno, raise an eyebrow or something? If that fits with his character.
"only one in the group whose eyes were still steeled." Not sure I understand this. Were the others' eyes "steeled" before but not now? Does this just mean she's the only one not in shock and staring?
"the man said, pointing at her" Why's he suddenly 'the man' and not Noah? I know I always get after you for this. I'm sticking to my guns! 'The man' could be one of those other wide-eyed shocked people... help the reader out! "And, you're not getting a lick of ours" Extra comma.
"They were hunched together, murmuring wishes that they hadn't survived the initial outbreak." That just reads weirdingly. " 'I wish we hadn't survived the initial outbreak,' she murmured to the one in front of her." Yeah, that sounds just as weird. I dunno. "Noah was staring at one of them." That tense doesn't read right. Maybe "Noah stared at one of them"?
"No match for the strength Noah still had" Also reads a little odd. Maybe just "No match for Noah's strength"?
"The woman was shaking..." could just be "the woman shook"
"but only to watch as she sobbed..." great moment here; I think it needs its own sentence. "been comforting her, stood back..." extra comma.
"She gurgled a bit and shook..." Hmm. Effect before cause can confuse the reader, it did for me here. Might be better to start this para with the knife in the chest rather than playing it as a surprise.
"the brown haired woman" Since she's been the only speaking/active one, I'm guessing this is the same as the "steely-eyed woman"? Would be easier on the reader if you didn't swap monikers midway.
"Noah could hear them now." Awfully abrupt transition there. If he's been expecting them, it would've been nice to have Noah listen for them or something a few times earlier on. Otherwise, this could use a better segue. "The woman glanced over her shoulder. Noah could hear it too." Eh, that's not a good one, but something along those lines.
"She turned and ordered her group to run." Not even one last glare for Noah?
"...hopping back into the bus." Wait. Time out. This entire time, I've been picturing the action taking place
on the bus. Damn it. Ok, rewinding... I think I got that impression from this sentence very early on: "Slowly, he moved toward the end of the bus." I was picturing him walking toward that long seat at the back end of the bus, and I guess it all snowballed from there. Huh. Maybe replacing 'toward' with 'around' would fix that. Or just show him stepping out onto the street or something.
"They were just people who'd decided... to join the extermination business." Hang on, why not steel-eyed woman, then? Did they have their own guns? If so, might mention that was why he allowed them to join.
"I don't know about you boys..." Is this their first job together? Because the opening paragraph suggests Noah's done this a whole lot. What happened to everyone else he's worked with? Or is he usually solo, and this is his first group outing? One way or another, some of this info could be dribbled out in between dialogue.
"Noah, began barking orders" Extra comma. "He sent John and Abe, to the back." Ditto. "Bullets le
apt out into the night."
"The men never stopped shouting excitedly." This needs something more. What are they shouting? Battle cries? Rebel yell, cowabunga, Rocky Top? Or is this meant to show they're nervous? Greenies? There's something here that's not coming across. "Not even once the crowd had surged..." I don't think crowd is the right word for these things.
"The number of creatures outside the bus were rapidly dwindling... ammunition." Two 'rapidly dwindlings' in rapidly dwindling succession. Might want to change one of those.
"Move the bus and run over the rest" Isn't it a flaming wreck? I suppose it belonged to the men, and crashed earlier. What exactly does he try to do to make it move?
"You've all done good. However..." Noah doesn't seem like a 'however' kind of guy.
"Noah looked around at his men" through "It's your call." That's all very domestic. Is the bus still rocking back and forth? Are the critters pounding on the door, trying to get in through the broken windows?
"the older man said..." :/
"The plan worked just as Noah had said." No! This is a key action piece, show it to us in the moment! "Noah braced himself, and gave a nod. Little Man yanked on the handle, the door flipped itself open, and Noah unloaded his shotgun at point blank range. Bodies flew backwards, and Noah leapt from the bus, etc etc." I'm sure you could come up with something better. Point is, you can't give us five paragraphs of dialogue explaining what he's going to do, then just gloss over it in two sentences of telling. I mean, you can, it's just... disappointing.
"When it was all over, Abe lay dead and the Big Man was nowhere to be seen." Again, this would be better shown than told. " 'Big Man?' Noah coughed. No response." Could be as simple as that.
"It doesn't take much of a wound to turn you into one of them." Bit 2x4 there, amigo. Could be a little subtler. "It only takes one bite."
"Little Man just stared. 'Noah?'" Should probably make this one paragraph.
"the older man" "the kid" *sigh*
"He turned to look
at John."
"Noah opened his mouth, but only a damp cough came." Same deal as when this happened before. It just reads oddly. I'm just now thinking that maybe this is coming from a movie sort of sensibility. Shot of the guy's face, he coughs, the camera pans down to show the knife in his chest. I can see what you're going for, but that pan's just not as effective in the written word.
"It was what he deserved." Oh snap. Multiple interpretations ahoy! Excellent line to close on.
Good stuff. I really like the main character of this piece, and his attitude toward the whole thing. They're just the exterminators. And they're not trying to win, just make it easier for the next guy who comes around and takes the job. It's a sort of different angle on the whole thing, and I enjoyed it.
The second half feels sort of disconnected from the first half. The final moment connects with that same moment in the first half, but the cast change feels odd. Any way to bring a few of those bus dudes into the first half? Even just mentioning a few names in that first paragraph might help here.
I'm not going to fight you on "Noah" vs "the old man" et al, but... well, consider my complaint registered.
Largely, my nits focused on a few areas:
-things that are confusing for the reader. Tenses, little oddities of placement or wording, stuff that isn't quite explained. The bus thing.
-the action in the second half, once steel-eyes leaves. There's a lot of narrative summary in the second half action parts. Not sure what's going on there.
Cool character, solid foundation. I think a bit of fixing up is in order, but this should be a solid piece.