Fixed blade, open cary knifes.

A K-bar on the hip and he could have opened up the animal’s jugular like a hot knife through butter (pun intended). He had the antlers, so getting the neck opened could have been an easy transition to make. Well, relatively easy under the circumstances

Stabbing won’t get it....bleeding them out always will.
If you’ve ever skinned a mature buck you would understand the trouble the guy in the story had. The hide on their necks is extremely thick and the muscles are like rocks from all the fighting that they do during the rutting season. Is very difficult to penetrate the skin of a mature buck with anything but a razor sharp knife, and even then there is nothing easy about it. A human would be like a marshmallow in comparison.