The new baddies have always taken damage in increments other than .5. A sword does .5 damage, a bomb does 0.375, and a bow does 0.25. This is to balance out the fact bombs and arrows make it substantially easier to kill them without giving them a chance to fight back. I might balance arrows to be on par with sword damage though. In a perfect world it's very easy to kill a baddy with a bow since it keeps them far away, but with all the players around it's not a viable method to kill baddies with. Too many players going after your baddy, no true lines of sight and such... Bombs will stay lower though, because of their potential to trap and damage many baddies at once, and bombs being very plentiful and much cheaper now.
However at first I was rounding their visible health to .5, but players would say... hit them with an arrow or bomb and it'd still say 2hp(they were at 1.75), and players were getting the impression they weren't taking any damage. So I made it round to .25 now to avoid any confusion.