A very difficult and doubtful decision going by the laws. The Umpire has to establish whether WYH's stroke would carry over the net into the opponent's (SN) space. This could be verified by the slow motion video action of WYH's stroke. SN moves into position to anticipate WYH's shot. With her racket held high she is facing WYH directly but from a distance divided by the net. How far is this distance deemed necessary to avoid an "obstruction" fault? It seems to be the distance that the striker's normal stroke would carry over the net without hitting it. WYH has a choice to make a cross-court net instead of a lift or a push down the line and avoid hitting into SN's racket. Indeed this the decision by one umpire I know who considers such a scenario not a fault against the receiver, ie. SN. Then SN should win the point instead of being faulted.