It happened on a rig landing on a 212 , very light machine and strong winds from the left . After landing and throttle to idle produced a yaw to the left. The Safety guys would not believe us till it happened to a 412 later .The paint on the deck was badly scratched and the deck was warped and needed some denting / painting work .Probably the skid / deck contact was inadequate and lacked enough friction.
This is similar to what might happen on an icy surface too !!