Touching the net first before the shuttle lands on the floor.

So I was at a league match last night.
I attempted a cross net shot from one post to the other. It was close but it didnt cross and was landing back on my side.

As it was making its way down, they touch the net before the shuttle lands on the floor.

I said he touched the net. He initially denies it. But then admits touching the net. But saying that the shuttle is dead/out of play as soon as it wasnt coming over.

I thought the shuttle is live/in play till the shuttle hits the floor. So the first fault will be him touching the net.

Then he elaborates that he has umpired matches and has read the rulebook.

Can anyone point me in the direction of the law that says if the shuttle is not going over the shuttle is dead before touching the floor.