if you know ur not that good.... or if ur nervous.... you shud start off with the easiest tricks first that you know for sure can land every time, 100% of the time. then, you build on it from there slowly, and ur confidence grows. i did LPs twice every day for the calgary stampede, one of the largest outdoor events in canada, and that helped me out quite a lot.
yea these guys did bad, but trust me, i've seen much worse here in canada for regional RBSS qualifiers haha. just give them props for having the guts to go up and try their stuff.
oh and one more thing... i'm pretty sure all of u remember touzani's showing at the first MOTG freestyle comp? remember how many times he dropped the ball on the simplest stuff? see how good he is now? exactly.