Schellas Hyndman is not a man worth messing with. Fortunately for MLS fans, comprehensive video backing that assertion up pops up from time to time.

The latest proof that pushing Hyndman too far is a terrible, no good, very bad idea comes from this video of the FC Dallas manager dropping a grown man to his knees with barely a touch. Hyndman was taking part in a radio interview that turned from soccer to, apparently, submission moves, prompting the black belt to demonstrate on one of his interviewers.

In case you were unaware of the former SMU head coach’s martial arts prowess, read this story from 2008 detailing Hyndman’s upbringing and eventual status as a master of self-defense. It’s fascinating stuff.

And in case you need further proof, here is a well-worn video that cements Hyndman as MLS’ toughest head coach (you can skip ahead to the 16-second mark).