Anchor: A person paddles a boat on a lake.
Entailed: A person is operating a paddleboat.
Contradiction: A person is riding a bike.
Contradiction: a man lets the concrete block crush someone to death, there's blood everywhere.
Contradiction: They would definitely not find any strychnine.
Contradiction: The blue eyes looked angry at him. 
Contradiction: Aside from shooting pool and drinking at one of the local bars, there's not a lot for a man to do in Fairbanks.