 Three other people were shot. The president, they thought the sniper rained down eight shots. Then he got his head blown off, thankfully. This 20-year-old was just beginning to find out. I'm Sergeant Dotz with the Albemarle County Police Department's Traffic Unit. What do you know about perception response time? Essentially, it's your reaction time. It's how long it takes for a deer, ball, dog, or pedestrian to enter your view while driving and you hit the brakes.