That threatened cop could have still fired his weapon up in the air to alert everyone when he backed off Crooks. But he didn’t. Why not?
You don’t fire a gun up in the air. You don’t know where the bullet will land. Besides the Trump rally attendees, the area is surrounded by residential and commercial buildings. The cops knew he was on the roof for several minutes before the shooting. The question is why wasn’t Trump removed from the stage then, or better yet why was he allowed to start his speech.