What you should have done is -----
Told the ECO on the phone , wait a minute , I see the shooter coming toward my stand and then fire a shot ino the ground . Then tell the ECO on the phone , never mind , I got him . I bet they would haul butt back to where you were located !
Just Kidding ---- I really wouldn't do that but you almost have to resort to this type of tactic to get anyone's attention .