Go ahead to the hospital now if it's hurting. It's common to have delayed injuries. You probably had the adrenaline going too. But next time, let the EMS come just to be safe.
Man I met Mutombo in Washington, DC as kid and he seemed cool. He was with his family and seemed down to earth. He took pics with us and played soccer with us (I was a t soccer practice). I've lost major respect for him after this. If this story is true it looks shady on his part!