The phrase works online because it is instantly understood without any setup: someone is running, and someone else is not letting them get away with it. That simple setup has made it a handy caption and reaction sound for short-form videos, gaming clips, and meme edits, where a few seconds need to carry the whole joke. Its staying power comes from its flexibility, since it fits playful teasing, dramatic confrontations, and ironic edits alike, and the line can be dropped over almost any footage of retreat without losing its meaning.