Yeah this was my initial thought too when I watching. Ledges fuck me all the time.maybe 2 misses, but the rest were hits, however, I believe on ledges like that, they are higher than what they look like, or rather the meshes of the models are higher than what they look like graphically. You get this when behind rocks that you can see the enemy, your gun is over the rock, but you keep shooting the rock, instead of the target, lol.