hm. The boost will be big, it will be 2 levels, and that is quite a bit...
He now plays away, so even when playing normal, he could loose if his opponent plays TIE. This gives his opponent a plus for the final game.
I would not play normal in this second game, I'd gamble on either playing CT to get it finished, but it is quite risky if his opponent also decides to CT. Or I would play TIE.
And I'd go for the last.
He has game 1, so he can loose this game. He won at home, so if he now TIEs, he will have higher enthousiasm for his final game, which is at home again. If he then CTs, he should win no matter what his opponent plays now...
They are not your friends; they dispise you. I am the only one you can count on. Trust me.