Task: Question Answering
Input (English): Context: On the way to work yesterday , I saw a crow land on the sidewalk with something in its beak . Immediately , another crow swooped down on him , and the two REALLY started going at it - claws , beaks , wings , cawing up a storm . The original crow ended up on its back and the whole flock descended on him , gouging and pecking at him . He struggled to get free , then finally flew off with a few crows in hot pursuit . 
Question: Why did the narrator stop on the street ?
Output (English): They were startled by an animal fight .