genetoy71 wroteBut intent of the back row player doesn't matter. Only ball position relative to the height of the net and player position relative to the attack line matter. If a back row player didn't mean to attack but she attacked according to the rules then it is still an attack.
If a coach wanted to protest that intent mattered, that would be a valid protest.
They'd lose, but since it's a question of correct/incorrect interpretation of the rule (and not judgement), it would be an allowable protest.
Judging ball height would absolutely not be grounds for a protest.