Wow, some real war stories here
The most my B&W clowns have done is whip my hand with their tails if I big them with my hand. I've even split an anemone threy were in while it was on the rock(part of the foot was in a hole, so I could not remove it). Though they will bite larger fish that come within an inch or two of the anemone. But they prefer to let the threat of an anemone sting deter any would be bullies.