[BUG] losing targets (after using skills?)

I noticed when playing with the Torchbearer that he would sometimes "forget" who he was supposed to be attacking and attack the nearest enemy instead.  I think, but am not sure (hey, it was 3 in the morning), that this happened after I used one of his "fast" spells (e.g., Rain of Ice or Deep Freeze).  Maybe this is intended, but it seemed very counterintuitive to me, and several times I lost a few chances to shoot an opponent because I didn't notice he'd gone back to firing at creeps.