Crash. what should the pilot have done?
Hard to be sure but looking at sun angle he was probably flying lee side of the cliff so might have anticipated a collapse. When the collapse occurred he should have immeadiately weight shifted under the flying part of his wing and if required a little bit of outside brake to maintain his course. Looks like he didn't attempt to keep a straight course and let the wing turn into the cliff where the wing suffered more rotor.