Lucifer's call

[sephiroth9006]

yeah i got this game a few weeks back. (Nocturne if your not in england) and i need help. the trumpter..i'm stuck against him.. i'll bring out a demon which is left with 1 HP and he'll use holy melody..but instead of targeting that demon he gets himself. o.O'
and from what i gathered it hits the thing with the lowest HP..so what's going on?

any stratagies?