Well, if he was smart, he'd have hit in a different spot.
Clearly Fat Kid A wanted him to punch him in the face. Fat Kid B does, which is stupid.
What he shoulda done is a snap to the jaw, from underneath, a blow to the neck, the elbow, or the solar plexus. That's if he wanted to win, anyway.
If this was for the sake of humor, not bad, he's done well to amuse me with his antics.