Justin Wang Powell’s “Falling Sparrow”, which recently won a Special Jury Award at Waco’s Deep in the Heart Film Festival, offers something one doesn’t expect to see in a film festival short. Elaborately choreographed martial arts…to the death. And that’s not the only unexpected aspect. It begins in what could easily be the Old West, albeit one where a menacing man in samurai shoulder armor shows up to retrieve a family sword and is rebuffed. Years pass, but at first it seems like centuries, as the action cuts to a modern MMA gym. But no…