I think some people are looking way too deep into this! Gary Cahill only had eyes for the ball, was he late, yes maybe fractionally but not late enough for any blame what so ever to be placed on him! Reverse the roles and Cahill is the one in hospital and I guarantee everyone on here would be saying, it's no blame of Mason's.
Also Cahill celebrating like he did was more to do with the fact we had given them a hell of a game and also the fact it gives them a cushion at the top. At the time of the second goal, none of the players will have known the extent of the injury so would probably assumed that it was concussion and he would be fine. Stop looking at the tiniest details and concentrate your thoughts on the player involved.