Yeah, the "pursue forever" is a bit ridiculous for all the mobs. Breaking their line of sight seems to work pretty well for me. Duck around something and sneak away or take another angle when they can't see you. They tend to go toward the last spot they saw you.
Leading them to other mobs is fun, tho. Take some lox to the tar pits and let them fight it out. Abomination vs Troll is my favorite fight so far.