He had the help of law enforcement - SS FBI - up until he missed. He probably didn’t know that once he mad he shot he’d be killed.
Possible who ever set this up gave him reason to believe he would survive and escape to enjoy a great life in a third world nation, China? Brazil? Iran? I smell a Honey Pot scam—a woman may have been his reward. His real phone is gone for sure. The kid was always going to die—he was the patsy. He may not have taken the shot and the sniper on the water tower did the deed—and shot the patsy to keep the real plot hidden.