genetoy71 wroteSo you're going to let a coach approach the stand and ask you about a back row attack AFTER you signaled legal? Not me. That's judgement.
It might (would) depend on why you said it was legal. "The ball was below the height of the net" -- sure, don't let the coach come over.
"It wasn't a third hit and the player didn't mean to hit it over so it can't be an attack" -- sure, the coach gets to come over.
And, yes, it's a little convoluted given the specific example given. But, the point is accurate.