premise: A man jumps from one boulder to another and two men try to catch him as he barely makes it. hypothesis: A man risks his life jumping from boulder to boulder as his friends make sure he doesn't fall.
entailment: It is risky for a man to jump from one boulder to another. He could lose is life. It can be inferred that the other two men are his friends. If they try to catch him, they are ensuring that he does not fall.