If I accidently grab one (not run ahead and pull, if I somehow get agro on a single in a pack we currently fighting) I'll hover close to the tank. Easy if melee I'm already there. Then I will attack something else. Gives the tank an easier time getting agro back if I'm not continuously wailing away at it. Unless, it is a squishy or otherwise fairly close to dead. Then I'll huff and puff and flail and wail until I can't flail and wail anymore and it is dead. Usually that doesn't happen, I attack first what the tank pulls first, or marks, but, eh, stuff happens.