Based on what little you said, two guys walking out the building shouldn’t be shot. The building has to be cleared or blown up before you know if they were, shooters, residents, all of the above or what. Even if they turn out to be the shooters they needs to be questioned to see what information might be obtained. Then, for my money, shoot em.
No way! They should have obliterated the building! No one walks out!
War...just a walk in the park.