I was at an aviation museum a couple of months ago and overheard a conversation between a curator and a helicopter pilot next to an R22 on display, discussing that crash. They couldn't believe how badly the helo was handled. The curator literally hung from the end of the R22's rotorblade like a pull-up bar to demonstrate and it barely moved, and there's a lot of clearance between it and the rear fuselage (bear in mind the R22 is fucking tiny and only weighs about 900lbs empty so applying 200lbs to the end of a rotor is more than it sounds in context). They reckoned she must have somehow flipped it upside-down then righted it violently or a similar manoeuvre that pulled jet-fighter levels of negative and then positive G to get it to do that. Obviously the R22 isn't designed for anything close to that and they said it was a tribute to the solidity of the design that it didn't just break into a hundred bits in mid-air from the stress on the airframe.