At that instant, he had no idea where the sniper was, or if he was still in the area. It shows a lot of courage to run to the sniper's field of fire.
Beau's theory is: the 4 murders a week-ago Thursday were done in such a compact time (about 2 hours span), he figures it has to be two people working together with the same rifle. He figures a couple of "loser" young males (early 20's?) who are egging each other on, and perhaps devotees (sp?) of "sniper video games" (he referred to one his son "plays" that, at the end of the game, declares "I am God!").
I hope the police/FBI are considering this theory -- and perhaps tying it to the shooting at the Bowie, MD middle school -- I wouldn't be surprised if there are a pair of psychopaths at Beau theorizes, that they went to that school years ago and picked up their "loser status" there. Just some thoughts on a terrible situation.