Mendi - if you think the player was intentionally trying to hurt the other player, then you have a technical foul. Other than that, you have no call.
For instance, if A1 is falling OOB with the ball and he turns and fires it directly at B1's baytzim, then you blow your whistle and signal the T.
Guys - don't worry. Mendi and I know what "baytzim" means.