nice double post, however you replied to your own statement...
Hongo was confuses and mistook Kenichi and hit him, sending Miu into a rage.. Now Hongo's eyes didn't look like before, it seems like he caught himself after he hit Kenichi - so there doesn't seem to be any chance of Hongo accidentally attacking Miu.
So yeah, how was it illogical for the demon fist to send Miu into killing mode?
Click to see what RPG personality you are.
(It's funny because I ALWAYS use a bow if its available in a game lol)