It doesn't look like the guy got beat from running his mouth, he got beat after striking the victim in the face. The other guy was just defending himself.
In regards to extra unnecessary pouches at the end.... I can tell you first hand that when you feel threatened and have a real fear it's hard to stop striking. I got assaulted down in PA outside a convenient store, actually knocked out! Some guy just snuck me, I never saw it coming. My brother kept the guy off me and after I got up I realized what happened and then me and him went at it.. He lost round 2..lol. I was so enraged I could not stop hitting him even after he was out. My brother and his friend had to stop me. Pretty scary stuff! The popo came and I pressed charges, even though his azz was beat pretty bad.