yeah, I know that when he hits the wall with his hand it has something to do with breaking her thought process about it but I honestly think it has to be set up. Even if she puts it in by hand wouldn't it come up with the same results?
I guess he just makes her do it manually then with that hand slap against the wall, that breaks her thought process and she pays out? Hmmmm...that's a pretty big chance to take with money on the line, hoping they mess up, but then that's where finding your mark comes into play I guess.