Peridot cannot back him up. Peridot is gone.

Actually, she's on the other side of the bridge. Having realized that they're probably about to get their asses tossed out of here, she has decided that time is of the essence to wrap up some unfinished business.

Plunk. She just took her last shot and sunk the ball into the hole. She looks up at Strange and points decisively down at it.

"THREE STROKES! That beats your four, I WIN!"

Susan turns back to Strange with the most unimpressed glare imaginable.