Ya, I can see your point. I couldn't tell you for sure why things shook out the way they did because I'm not a judge and I didn't see the score sheets. I'm guessing Billy's rail advantage outweighed Proses' air tricks.
Proses really knows how to put together a smooth run and pack in a lot of tricks, but I thought Billy had better amplitude and style. I wouldn't want to be a judge, that's for sure!