context: A man is tossing a knife in the air while another man stands nearby.
hypothesis: We believe that a man prepares to show off his knife-wielding skills
valid_hypothesis: We believe that a man prepares to show off his knife-wielding skills
invalid_hypothesis: There is little chance that a man prepares to show off his knife-wielding skills
hypothesis_assertion: A man prepares to show off his knife-wielding skills