Get on all fours and growl every time he moves. It'll freak him the fuck out.
Also, you're a rapping marine who makes $500k a year, just tell him your life story and then sock him in the jaw the second his eyes tear up.
When you're fighting him when standing up, make sure you aren't facing him. Hits to the chest are allowed but hits to the back of the head and kidneys are discouraged so it's better if you aren't facing him.