Anchor: He prepares no defence ”no shadow of an alibi, yet he knows the chemist's assistant must necessarily come forward with the facts. 
Entailed: The chemist's assistant needs to give the facts.
Contradiction: The assistant shouldn't speak at all.
Contradiction: The man is swimming across the river.
Contradiction: Some of the pieces may have to be shipped back home.
Contradiction: The man jumps to get people's attention.
Contradiction: It is possible that they will need to be dealt with.