KANSAS CITY, Mo. — As Kansas City’s Super Bowl victory rally was wrapping up Wednesday afternoon at Union Station, Chiefs fan John O’Connor was standing stage left when chaos erupted. O’Connor, of Kansas City, was turning to leave when he heard the gunfire. People began running away to get to safety. “It sounded like fireworks. It sounded like a ton of very rapid succession, very quick shots. So, I’d say 15 to 20 in a very short amount of time,” O’Connor said. “I didn’t really take off to start. A lot of people did. And then it kinda just seemed like someone was hurt and people were running mo…