Very awkward MTT staking situation - What would you do?

[Flipper IRL]

Ok, this situation almost arose a while back and I was wondering what would you do in this situation?

I'm doing nothing on a Sunday night and a friend asks me on MSN will I play the Sunday Million ($500 one) for him as he's going drinking for the night (We live like 200 miles apart thou). We agree 50% of nett returns (so, 50% of any cash). I say ok, log into his a/c and register.

A few hours passes and we're down to the business end with 200 players left. I've txt'd him every now and again and given him updates. He comes back from the pub. Here's what could have happened (but didn't...)

He says thanks, and that he'll take over now. You know he's had 8-10 pints and even though he is an exceptional player, you feel he has drank too much. What would you do when he asks you to log out and let him play?