It was Silver Hand who stopped Mu Sha from committing suicide.
"Are you a devil?" the marbled pig said. "If he commits suicide, we can clock out and go home."
"No way!" Silver Hand said firmly, "If we agreed to fight for ten hours, we will fight for ten hours!"
Mu Sha didn't know, but his feelings were real.
He was indeed dueling with many strong competitors, including those with dark logic personalities.
As for Gao Xin himself, he was actually sleeping.
Though you can technically rest in the waiting-to-fight area, getting a good sleep is quite difficult.
Because some people's battles end quickly, and you never know when it might be your turn, at which point you'd be woken up.
By comparison, you can rest better during a duel!
Because there's no time limit for a battle.
Theoretically, you could fight indefinitely.
Of course, you can't engage in passive combat, such as sitting around and chatting.