Not sure what all happened to this poor hunter other than he got stabbed in the leg by his own knife, while trying to finish off deer. That ole trick, to run in there and slit the deer's throat so they'd bleed out, have done a few but, might not be best advice on a buck with a decent rack. Old Buck gonna know how to use those antlers for defense til the end.
Another good trick;
Stand on the antler (or an ear if it's a doe) when you put the knife in.
If you don't carry a tourniquet as part of your normal hunting gear you should rethink your gear setup and include some basic trauma gear. Our tools are guns, arrows, and knives. Bandaids don't do much for bullet holes.
I keep a tourniquet in my computer bag that I carry daily for work, 2 in my truck, and 1 in my hunting pack.
The best trick is to NOT stab live deer. But that's just my opinion. I always seem to have at least one spare round in case I need to finish off an animal. Although I can't even remember the last time that happened.