Anchor: At last she heard footsteps inside, and a moment later Mrs. Vandemeyer herself opened the door.
Entailed: She heard footsteps, then Mrs. Vandemeyer opened the door. 
Contradiction: No one opened the door. 
Contradiction: No warning was given to the participants at all.
Contradiction: A person is in the water.
Contradiction: The man is not wearing any clothes.
Contradiction: If you want to live then you should probably surrender.