Can this be challenged?

[Scrapper1]

Originally Posted by bob jenkins

If R1 judges (a) the ball is in the plane of the net and (b) A1 has a body part higher than the top of the net (both are judgments which cannot be challenged), then what does it matter? Either A1 touched it first and it's an illegal attack or B1 touched it first and it's an illegal block.

Whether either one touched it can be challenged, but if that's not in doubt, ...

But the question is what if A2 touched it before B1? That would eliminate the illegal attack. So can the officials review if A2 touched it first? It's a "touch" decision. I'm wondering if it falls into the touch category for review.