Strength gap

When Zhang Weishan said this, everyone around him was a little confused.
Everyone knows that Zhang Weishan's best skill is his punching power. The power of his punch can knock an adult into coma.
He actually wants to compete with Samwell Bishop in boxing strength and even fight him head-on?
Isn't it obvious that he wants to knock out Samwell Bishop with one move?
If Samwell Bishop wasn't stupid, he wouldn't have accepted it, right?
However, Samwell Bishop was obviously a fool...