Serra is boss. In the GSP fight he didnt just land a lucky punch, he landed a hard shot which dazed GSP and swarmed GSP for like 10 seconds with successful GNP and killer instinct to finish the fight.
"Let them see that their words can cut you, and you'll never be free of the mockery. If they want to give you a name, take it, make it your own. Then they can't hurt you with it anymore." - Tyrion Lannister