How can you be 100% disabled and pass a USCG physical to have a Merchant Mariner Credential?
If he has one, he probably wont for long!
I feel bad for the kid. He should have throttle dropped him and let him swim back to his buddies.
I've seen a lot of hot headed Captains and Pilots (often due to low sleep, long hours, financial stress, a sprinkling of substance abuse and being born an asshole) but despite their arrogant misguided rage, they were never quite stupid enough to throw a punch or set foot on another's vessel.
The only way that guy should be allowed to continue fishing is if he becomes the best F'n fish bait in the ocean!