Anchor: A man in a black wetsuit is surfing in the waves.
Entailed: There is a surfer in the water
Contradiction: the chick is skin-boarding.
Contradiction: He was very weak.
Contradiction: an infant is resting
Contradiction: The ice is so thick that merchants have no trouble fishing.  
Contradiction: He welded new cleats on the steel pads and then reassembled them.