Anchor: He was up to his hands and knees, and almost managing a walking pace.
Entailed: He was moving almost as fast as someone walking would be.
Contradiction: He sunk into the quicksand passed his head. 
Contradiction: A man without tattoos is doing a handstand on the floor.
Contradiction: Two skis out in the winter.
Contradiction: I am sure.
Contradiction: I don't know how.