premise: An Ambulance is passing a man wearing a bandanna and girl. hypothesis: The man in the bandana is running after the ambulance.
contradiction: If the man is running after the ambulance, then the ambulance cannot still be passing the man. He must be behind it already.|contradiction: A man cannot run after an ambulance when it is just passing by him.|contradiction: When  An Ambulance is passing a man then the same man cannot be running after the ambulance.