I recall an incident awhile back in which I was the guilty party.
My local woods field does banded and non-banded teams. I was on banded, pushing through some bushes and saw a guy shooting an old VM68 with no band on his hopper, so I fired a few off through the thick brush and ended up getting him with 2 on the back of his head. He turned and then I saw the band hanging from his feedneck down the opposite side of the gun. He was pretty pissed and I felt bad but I explained to him that if his band's not visible on the hopper then that's his fault.
Turns out it was his first time playing. Bet he won't do that again.