geeze thats easy its a BIN..... from experiance thats just second nature, in about 2 second your face hits the deck, you leg gets pulled back and you tear your quad, then you get the bar end stuffed in your chest HARD, real hard and then you lay on the ground gasping for air for at least ten minutes.
Happens to me at least once a year, bruise up for at least a weak and then remind my self to stop riding the modern when i get tired, rather than going for one more lap, before we pack up.