I believe "Sniper No. 1" has left the area at least temporarily with someone else. He is the arms expert, No. 1 marksman and the planner.
The second "sniper" is now active and responsible for the last two "Non Kill" shots.
He and a third person will continue to take "non'kill" shots.
What is "Sniper No. 1" up to??
Don't forget, Atta and friends constantly rented vehicles for a couple of weeks at a time to get around. Rentals might be a place to look.
Sac
You are reading to much into why the last two victims survived.....Fredericksburg victim has loading bags into her minivan....she moved as he shot.
Todays victim....was getting out of car......could have turned at the last minute to say goodbye to his Aunt..