Uh, such an exciting race, and not even a thread?

I have a question, now that it's over. How do you get that !&*£ "inner loop-cut jump" to work? The kind where the car starts climbing on the inner edge of the loop, and then suddenly points down and continues ahead?
I can't find a good example right now, but I remember seeing it in some
ZCT139 replays during the race.