Yes I have seen two people hit by stray pellets like you describe. One was standing fourth in line at high eight when a pellet came back from the target and hit his shooting glasses almost dead center on his left eye lens. No doubt it was from the target just shot by the shooter on the station. Second was a shooter who was hit pellet from the load he just shot at station four. Pellet hit him on the fore head about an inch over his right eye. It broke the skin and was in fact still on the surface after breaking the skin. Flat as a plate so it did not penetrate at all. He was not wearing shooting glasses that day and was lucky not to loose an eye or at least suffer serious damage. He does wear glasses all the time now when shooting. He has found safety religion.
Bottom line is that if you shoot long enough you see all types of weird things and almost impossible freak events. Wear ear plugs and eye wear at all times. And stand behind a fat guy when ever you can. He can shield you, protect your gun and make you look thinner at the same time.
