Actually, as I was standing in my office practicing the Ninja flip motion, I was struck by a new way to do it.
Mind you, I'm not saying it would be successful, but I think it may have as good a shot as any other method, and less injury risk than some. It may actually be what some of you are thinking of as the Ninja star flip, but the wrist motion is different than a frisbee throw.
The Option.
Facing 3B, foot on 1B side of the bag to protect yourself (somewhat) from the incoming running. Take the throw from SS, reach in with hand, take ball out and throw it with a motion similar to an option pitch in football. It would seem to be more accurrate and faster than Ninjas Star flip, since throwing a baseball like a frisbee would seem to present problems.
Can you give that one a shot too rojo?