Actually Wirra did not even try to hit Jones, He jumped and spoilt the ball, did not bring his shoulder or hip to bear, Jones just ran into him.
As for Bradley....... I can't remember him doing that, but nor do I remember him pulling out, maybe he did position himself so he would not have to, that I do not know.
Jones had to go and did, if Jones had noticed Wirra earlier (which I do not think he did) he should have jumped himself to try and chest mark and ant worst have leg across him self and his arms in front of him.