I was 4th man on a 5 man rope team coming down on the Emmons glacier many many years ago. All of the sudden the guy behind comes ripping down right beside me to my surprise. He is like a turtle flipped on its back on an ice rink. I immediately go into self arrest and think, "This is gonna hurt my hips!" It just so happens there was a rope team right next to us going uphill. As he went past me and I went into self arrest, he took out two people on the rope team next to us like he was a Nebraska Cornhusker linebacker and the other rope team were cross country runners.
I managed to stop him. Oh, and it did hurt.