The teenager was evaluated on site for a right knee injury on Sunday night. It's not clear whether he was hurt jumping out of the way or was struck by the sled.
Snowmobiler Jackson Strong tumbled off the snowmobile during the best trick competition. The throttle stuck on the 450-pound machine and it swerved straight toward the crowd - fans scurrying out of the way. The snowmobile came to a rest when it got tangled up in the retaining fence.
Jeremy Bester, of Prior Lake, Minn., quickly applied the brakes to keep it from moving.
(Copyright 2013 by The Associated Press. All Rights Reserved.)