It's a military tactic...
A sniper rifle is also considered a crew-served weapon. Though it only takes one person to fire a sniper rifle, it really takes two soldiers to get the most out of the sniper-rifle weapon system.
That's why snipers always work in pairs. A sniper team consists of a sniper and a spotter. The two-man team offers many advantages over the deployment of a lone sniper in the field. Typically, the spotter is the more experienced and more accurate shooter of the two team.
It's why we sometimes here when an assassination attempt fails, security will be on the lookout for a 2nd shooter.
Yet, I'm not saying Crooks had military training. I'm just pointing out the fact that when Trump was shot...TV journalists
consistently explained why the Secret Service was behaving the way they were when they jumped on top of Trump to protect him...
They were in fear of a possible 2nd shooter nearby
inside the staging area while knowing the initial shooter had just been eliminated
outside the staging area by Secret Service snipers.
By the way, about
21% of the Secret Service people are ex-military...military Veterans who understand the advantages of a sniper that works in a two-person team.
That 2nd person of the pair is typically the most dangerous one of the two.
wrbtrader