General Zod
TGT Addict
I'm a helicopter pilot - loss of tail rotor effectiveness (LTE) at high density altitude. These guys were extremely lucky. Probably flew off to change their shorts.
A blurb I read about it on another site claimed it had to do with hitting an air current off that rock face, but I don't know enough about the insane devices that fly by beating the air into submission to be able to judge the accuracy of that statement.