When should a player yell help in volleyball?

Answer 1

Any player can yell help at any given time. Any player should yell for help when they see that they're teammate has hit the ball out of bounds and someone needs to save the ball, if a teammate attempts to hit the ball and they miss it, or usually if a player from the opposing team serves, spikes, or barely hits the ball over the net and the front line is not expecting it or not paying attentin (which should never happen).