Last night playing doubles I was at the net. Opponent hit a weak ball that floated over the net. I waited to hit it until it seemed part of the ball was on my side of the net but part of it was still over the net so part of the ball was still on their side. Is the ball able to be hit as long as it was partially on my side of the net or does the whole ball have to be on my side of the net? My racket or body did not touch the net.