One of my former Martial Arts Instructors is a case in point.
Dude was a legit badass............held several different black belts....moved to Korea to take Hapkido there...ended up getting his black belt there....anyone who knows what that involves as a 'westerner' will understand.
Anyway...he is a very unassuming 6 foot 185 lbs. Pretty small compared to many of us in his class. Looks like a nerd basically.
This guy was unreal.... I cannot get over how much power he had. Sparring, I have taken shots that fractured my ribs, but that was fucking nothing compared to a fucking left JAB from Matt (the instructor)......I had a heavy muay Thai forearm pad on....one that could handle kicks with ease....and I swear to God....Matt's jab hit so fucking hard, it had me thinking he snapped my arm in 2! Holy shit.
So moral of story.....there are some really really scary doors out there....l need to remember that more often before my temper gets away from me....