Great comeback. I'm talking about all the humanoid bosses in NG2. Not one boss here, one there. So Genshin, Wolf guy, Elizabeta, lightning guy, even the spiky spider ninja guy. Considering you fight Genshin three times and the rest twice, that's almost all the bosses in the game. Try your little trick on alma 1 and see what happens. And on Murai 2 (oh right, no walls.) And on fat cyborg guy (oops, no walls again.) GG. Bosses in NGII are trash.
level 2 or 3 lunar -> X,X,Y with some decent blocking = death to humanoid bosses in NG2. Unless they have 6000 IS ninjas with them to add artificial difficulty. But even then, if you kill off the IS ninjas in mentor, the bosses fall for X,X,Y until the ninjas come back.
horrible, horrible game.