 Their responsibility is to be panning the area. They have long-range binoculars. Maybe the individual was just camouflaged in such a way that he wasn't able to be seen until he started firing. And when he started firing, then the Secret Service returned fire, killing 20-year-old Thomas Crooks. Now another question to be answered. Why did he do it? Live in the News Center, Mark Garrison, WBT News.