premise: Four men playing their instruments in the street while men and women onlookers stop. hypothesis: The man play tag while the onlookers call the cops.
contradiction: In sentence one the onlookers seem to be stopped to watch the men playing instruments. In sentence two the onlookers are calling the cops as a man plays tag. These could be two separate incidents or could be happening at the same time but the onlookers would be doing something or nothing.