A friend of DCist, former Mount Pleasant resident Anthony O’Rourke, was in town visiting from New York last weekend and recounted witnessing a run-in between two “gangs” of teens on the Red Line. O’Rourke’s observations aren’t necessarily a story of racial adolescent struggle, it is something greater. You may be familiar with the 1979 classic “The Warriors,” perhaps the best (or only) sort-of post-apocalyptic subway gang action drama based on Xenophon’s Anabasis ever created. Well…