You can put it into a game theory matrix if the champion and the newbie are matched:
Champion is honorable, newbie is sensible:
Champion says, "I don't want to kill you in the ring. See you when you have a worthy record?"
Newbie replies, "I'll be there sooner than you expect. Can you get the organizers to set me up against [appropriate opponent name] instead? Or can we do a sparring exhibition?"
Champion is honorable, newbie is stupid:
Champion says, "I don't want to kill you in the ring. See you when you have a worthy record?"
Newbie replies, "I'm ready, old man!"
Champion says, "Talk to my lawyer, punk."
Champion is horrible, newbie is sensible:
Champion says, "You're going down the moment the bell rings."
Newbie says, "I didn't sign up to be killed in the ring. If my manager can't get me a suitable match, I'll have to default."
Champion is horrible, newbie is stupid:
Newbie goes down the first time he's hit, and wakes up in the hospital with career ending injuries.
Note that none of those cases include anyone taking a dive.