No idea.
All I remember seeing was fat pigeons slumped over on the wall.
It was a cinderblock wall made to look like stone; not an electrical engineer, so I don't know if that makes a difference.
It could be a memory fabricated by my psyche for all I know. Lol
Depending upon where you live, that could have been a kid on the other side of the fence with a BB gun.
Until the age of 11 I put as many mourning doves in the gumbo pot with a BB gun as the grownups did hunting with shotguns.