Dave Lister wrote:
Yes I understand that, but Webb was 10m infront of the play the ball. At the next play the ball, he was illegally 10m further forward. Therefore closer to the next play the ball than he should have been. So by logic he should have been penalised in the first instance of being offside, which could result in a raft of penalties.
If he doesn't get involved, once the next tackle is made and he behind the ptb, he is onside, it doesn't matter where he was for the previous tackle, or two tackles before that, or 10 minutes before. It is where he is for that ptb.