Leo: if America settles for the Patsy, America will BE the Patsy; @realDJStew a "Person of Interest"

Leo Donofrio on the new footage
I started thinking the same thing when I re-watched. Could be he sensed the buildup, you can see that in the larger clip, but he starts running alongside right before the gunshots. Leo thinks he saw a man with a rifle following him.

It's also suspicious that the FBI took his footage from PA police and returned it.