sentence: A man is on a skating rink with his left knee up and his right knee on the ice as he slides and pushes an object. sentence:  The object slides between two men who are moving something back and forth on the ice as the object follows behind it until it stops. sentence:  A man near them has fallen and he gets back up. sentence:  There are various people on the rink, most are upright doing their own thing on the ice but there is one person in a wheelchair.