there are no rules, however the question your asking is this,,,
If I am a PRO raquetball player would I want to be HIT by another? the answer is No, so, 99% of the time a player will go out of his way to take a bad shot as to NOT hit another player,
Ive been hit many times by bad players, after the 3rd time, I hit them,,, they usually cant walk after my bag azz tees up on them:nohead:,,, and they dont make that mistake again,
lol, Ive never blown up a new ball, but I have destroyed a few that were a month old or so, I can crack a pinch shot that will make your ears bleed.
tater