I think if
1. He says he is sorry and that he is a charged man within a tone that is believable.
2. Stays calm
3. Attacks clinton on Bill clinton on his rapes
He will be seen as the winner. Any anger Hillary shows will make her lose.
If he attacks Bill, he'll be done for. HRC's highest approvals were when the whole Bill scandal thing happened.
You can also put money on 1 and 2 happening. If he didn't even seem remotely sorry while on a recording reading off a teleprompter, he's not going to be either sorry or calm with HRC poking at him.
