Good morning, Laura
Getting "shot down" can refer to a public humiliation. This would be something that happened close to home, and it could involve a theft (cutting a hand off is a traditional - VERY old - method of punishing a thief).
Since this happens to people as they try to cross the road, this can be a reference to crossing a line - going too far. It can also refer to switching sides.
I know this isn't much, but I don't see much to go on here. Hope it helps.