What does Deuteronomy 22:24 mean?

bring both of them out to the town gate and stone them to death—the woman because she didn’t cry out for help, and the man because he violated someone else’s fiancée. You have to get rid of this kind of evil among you. Deuteronomy 22:24 - Modern Text Bible

(The assumption is that if it happened in town, someone could have heard her if she called for help. Both are held responsible.)