Not a heli crash, but on Thursday evening on a single track road, a teenager with three of his mates in the car came round a corner towards me at about 60mph when he should have been at 20, and had no hope of stopping before he hit my car. Fortunately I had a Land Cruiser and he had a Ford Escort, the result was fairly predictable: his car written off, the land-cruiser showing scars but still fully driveable after the event. I love that car!
However in the 1 to 2 seconds I had after stopping my own car and with nothing else to do but watch his 180 foot approach, with a 90 foot skid trying to stop, and having been in accidents before, I still found myself at the point of his impact simply closing my eyes, still with my hands on the steering wheel, still with my foot standing on the brake, when I know I should have pulled my legs back and taken my hands off the wheel.
Unless someone has amazing self-control or repeated training, you can't control what you are going to do in the few seconds before disaster. Maybe if I had had 30 seconds to prepare it would have been different, but I'm not convinced!
BW