context: Police officer and his motorcycle in a crowd of people at a protest.
hypothesis: It is probably the case that a police officer is arresting someone in front of a crowd.
valid_hypothesis: We doubt that a police officer is arresting someone in front of a crowd.
invalid_hypothesis: It is probably the case that a police officer is arresting someone in front of a crowd.
hypothesis_assertion: A police officer is arresting someone in front of a crowd.