He tries to fly, but jumps up and just falls back down, then he tries to laser with his eyes but that doesn't work. He realizes his powers are gone. He's a mortal now. He's nothing without his powers.
He gets beat up and bloodied, and wails and says "Estawp" (supposed to be stop)
He even begs that he will do anything, including sucking.. male reproductive parts (in his own words, "I'll fing suck your d*!") and also eating poop. (in his own words again, "You want me to eat your sht, I'll eat your f**ing sht!") Yes.
You can either start before you whoop his ass or during when he's begging or any point to be honest
(Before the begging, He tries to punch you but you block it and basically that's when you just start beating him. He doesn't have any powers and can't defend himself so yeah, just beat his ass.)