Why do the imperial soldiers swarm Luna but she brushes them off like nothing and then she gets to give her speech totally uninterrupted? Won't they chase after her?
They are magitek soldiers. Nifilhim now has custody over Luna and Accordo can no longer protect her. She still needs to give the address (people need to be put at ease prior to evacuation) and because Nifilhim (for a variaty of reasons from a variaty of people) want Leviathan to appear.
She brushes them off because in that moment they mean nothing to her. They don't run after her because their objective is already complete.
I've explained this before.