So this happened in Dombay, Russia, allegedly. It's all fun and games until your giant inflatable ball goes skidding off the side of a MASSIVE mountain. 

Hope everyone was safe.The translation from this Russian news source isn't too promising:

Instructors do not keep track of Zorba and he flew down the hill, the second boy took off from Zorb, one guy was lying no visible signs of life, the other crawled up the slope and stopped 10 meters, rescuers were getting very long time (well, as rescue workers, with two skiers first-aid kits, because we have not seen no medical snowmobiles, nothing). On the slope where the run Zorb had no fences, the same ride skiers and children on sleds.

[H/T: Reddit]