If they were 100m away, why did it take them several minutes to arrive while the helos circled? Even when crouching (from my exp in the the army), looking for ambushes during house fighting you're faster going down a street than this.
Regardless, this discussion is now irrelevant, as it has been confirmed elsewhere that the photo I posted above was taken at this scene, presumably while Namir was peeking around the corner. That photo shows US troops no further than 200 m away, if I recall that lens's capabilities correctly.