also theres the fact that ferguson was chasing him from behind and to the side with a highly obscured view of the ball carrier. he knew that it was 2 on 1 on the fullback, he knew that the most likely option for the ball carrier was to pass it to inglis, so he tackled him when he thought inglis would get the ball - and he was only a tiny fraction of a second off.
do you seriously think that in that extra fraction of a second inglis wouldve been out of reach of ferguson, who brought him down with a tackle around the shoulders? im sorry but i just dont see it. and again, inglis didnt even make it over the try line as it is.
think about it this way - if this happened on the 20m line would you give it a penalty try? by your summary of it inglis wouldve gone through basically untouched had ferguson not tackled him illegally, and with no other defenders within tackling distance inglis wouldve run the extra 15m and scored. youd be happy with that being awarded a penalty try? what about if it happened on the 30m line? again, no other defenders near him, and since its inglis you assume they wouldnt run him down. how far can we go back before we assume that he wouldnt have scored? 50m?