after watching the video again a few more times and just to stir things up a little bit more, I would be looking for "Sneeky Pete" and a shot of his infamous NO2, once you release that stuff there is no slowing down. I use it in my wheel-standing super scooter.
First off, he is the defending UMP champ. So if anyone has the green light to throw a slider like that, it's Gilpin. Second off, if you don't want to get slided on like that keep the door shut. Especially with guys like Kenny Wallace and Gilpin in the same race as you. You can't just ease it on in there. JMO
I think it looked worse than it was because instead of tapping the brake and turning under Gilpen, he just slammed on the brakes and almost stopped. Clean as far as I am concerned.