Level up Card

[drmunchkin]

In the rules, and on forums, it seems the 'Go up a level' card can be played at ANY time to go up a level expect to win the game.
I was wondering, if this is correct, say for example, you are level 7, you have two 'Go up a level' cards in your hand you are holding on too and you are turn up a monster, say a level 14, ask for help, a player offers help.
no other players offer a way to stop the victory, could you THEN use the 2 cards, go up to level 9 and win?
it seems REALLY cheap, the player helping already has all his help in and can't decide to NOT offer help at this point. thats why I ask.