[ister]

Different opponents have different scripts. Some of the scipts have the creature attack whoever hit it last, some cause it to switch targets so that it tries to get to the back lines. For instance, in BG the gnoll scipt gets them to go after your back liners all the time.

I'm not sure why the missile scripts don't do this some times too. I disagree that it makes more sense for the enemies to always target the closest party member (although it seems that they do) - different enemies should use different tactics to keep you on your toes. I think your right that the missile scripts always attack the closest party member. I wish it weren't always so.