Don't forget R2 has rockets that enable him to fly short distances. Of course, that wasn't apparent in the original three films, maybe R2 forgot he had them. Like Obi-Wan forgot about midichlorians. And George Lucas forgot how to write a story and direct a decent film for the last three, which are technically the first three. The shit ones. Phantom Menace et al. Anyway, Raiden is amazing, and Big Trouble in Little China is one of JC's greatest films.