Ninjaball? Cause I can. :)

So this post isn't about Technology, but I still figured I would share it.  I used to call this Ki Ball, and the idea was to have a person with a weapon at either end of a racket ball court, hitting the ball back and forth trying to hit targets behind the other player.  While the game never developed, I still practice it, and I'm looking for ideas to turn it into a game.

Questions:
1) How could this game be played out?  What rules/challenges?
2) Dangers?  If a weapon is accidentally thrown, that could hurt.  Even taking a racket ball to the face after a good hit from nunchaku would hurt a lot.