Herb Dean

Herb Dean is a referee for the UFC. As such, Herb Deaning someone is the act of interrupting or pulling your friend or someone else away from someone getting completely dominated in a fight/already knocked out, so as to avoid any permanent damage to the victim.

Person 1: Holy shit, dude, did you see Adam get his shit wrecked by Jake yesterday?
Person 2: Yeah, it was great until John came in and Herb Dean'd Jake.