Great story! Congratulations on not cutting off your knee cap and getting a really nice buck.
As an aside, my dad's been a logger/road builder his entire life and was out cutting some boards with a chainsaw in his front yard a couple of years ago. There were a bunch of kids and a couple of dogs running around and he was paying attention to what they were doing rather than what he was doing. The saw kicked and hit him right across the forehead (this is a guy that's used a saw off and on at work for over 30 years). He had a cut similar to what was across your knee across his forehead. Knocked him right to the ground. As it was healing he kept telling everyone that he cut himself shaving.
Back in college, I spent some time on a landing limbing and bucking. I knicked my boot without touching my foot and sawed into a pair of chaps. Both times I got lucky and wasn't hurt, although I screwed up a pair of boots.