Replying to Pep fujas vid

i'm sure by now you've all seen pep's switch 90 to 270 revert at the JOI, if you haven't check it out in the top rated vid section. anyways i decided to show it to my physics teacher who happens to ski and he was completely baffled. he watched the 8 second clip for about 5 minutes over and over and he kept saying it was the "sickest" (yes he used the word sick) trick he had ever seen on skis and that it had to be the most difficult one ever too. he really couldn't come up with much of a scientific answer and he just watched in awe like the rest of us- that was a fun physics class