You got away lucky! I was out motocrossing and just as we finished and were riding down the tarmac road at the end i stopped and got off, as my mate was coming up behind me I turned around and just as I did his front wheel locked up which resulted in him doing a massive endo then the bike falling on its side, one bolt was missing and it had torn the last of the tread out of the second, luckily he was only doing 10-15 mph on a 350 ktm so nothing was damaged. we just put the caliper out of the way and rode home slowly.