The shooter very probably had military training, but a 200 m shot with a scope and a tripod is an easy kill if there's a clear line of sight and the target is stationary.the shooter had military training. snipers have 2 man team. you have a spotter and the sniper ask anybody who serve in the Military
Didn't need a spotter. Perhaps an accomplice doing security on his escape route. But that's one extra big mouth to worry about.