Talking of Dobbie, I haven't seen any mention of his tackle of Simmonds just before Capstick's try.
Textbook stuff, or at least the textbook I was taught from in the early '70s. Got low and drove his shoulder up in to Simmonds' midriff (we were taught solar plexus), head on the outside and dumped Simmonds on his back. That was a try saving tackle, unfortunately they went on to score.