I pretty much agree with everyone. Only thing...if her lawyer is telling the truth about a pothole and loose gravel on the training course, well, probably shouldn't have been a pothole where newbies are learning. I'm assuming the kind of newbies that are still learning how not to fall over, not like one of us taking the course as a refresher. I mean, if it was a CRATER. Probably ought to sweep gravel off the course ideally, too. I would if it was my business. The legalese makes it sound pretty unrealistically "puffed" up, to me. And if she signed a waiver of responsibility, then, too bad, baby!
For more advanced classes, dump a load of sand and gravel, throw out a few dead opossums, pour a few puddles of Mobil One here and there, and hire some 4 and 5 year olds to run out from behind things unexpectedly. Oh, and rent a couple of pit bulls with a distaste for loud noises to chase the trainees. That's training!