Originally posted by Blaedmon:

Ive just had this - all i did was, enter dungeon and start swinging with a blackmetal axe immediately. get a few hits in and leave. Rinse/repeat but wait like 20 seconds and they usually face away from the entrance spawn. U can get lucky with a stagger.

Can also try placing a campfire there so the enemy burns while you're outside. :)

This method is (was? might be fixed now) pretty fun against Trolls in their little Black Forest caves.