I’ve been flying RC copters for years, and know a guy who flys the real things. While autorotation could save you, it’s pretty unlikely, especially in the low altitude conditions most small choppers fly. He said it best when I was explaining the trouble I was having switching from RC planes to RC helicopters when he said “planes naturally want to fly, helicopters naturally want to crash”. A heli is in a constant state of fighting, both gravity with the main rotor, and it’s own instability with the tail rotor, just to stay in one place.
Almost every plane will glide though, and the controls remain the same as during powered flight. Keep speed up above the stall threshold and hope you can find something relatively flat to land on.
Anyway, back on topic. RIP to the 4 of them.