Rule

Y.M.C.A. Four-Wall Rules · American four-wall

Rule 10 Ball striking a player

Historical rulebook: not the current rules. The current rules are here (USHA Four-Wall Rulebook, as of 26 January 2025).

If the ball, when served, strikes the server or his partner, it retires the server. If it strikes the receiver or receiver's partner, before or after bouncing, it becomes non-playable and counts a point for the server. If the ball in play, while being returned by a player, strikes an opponent it shall be played over, but if it strikes a partner it shall count against him. If said ball in play be returned from the front wall and strikes any player it shall count against him.

Mentioned here

How these ideas connect in this rule

No link to the other terms shown: Opponent, Partner, Front wall, Point. 14 weaker links (terms mentioned together in few sub-rules) are not drawn.