Good reminder story to ALWAYS verify that your hog is actually dead, not mostly dead, but fully dead. We check for breathing, head movement, ear twitches, and finally blink reflex. If any of those are present, the hog gets another shot. After being lunged at by a hog that I was checking, is why I do the blink reflex last because that puts me close to the hog to do it. Fortunately, the hog that lunged at me had been spined and his lunge was extremely short.
Did you happen to notice where he was shot?
Sounds like he had a lot of life left
We can make some guesstimates on where it was impacted and then some wild conjecture on what may have resulted. Assuming a 100 yard zero and a target at 100 yards, the elevation will be where indicated by the crosshairs.
Now, the hog was in motion when shot. I would guess from the video, maybe 2 mph. That converts to 35.2" per second.
Depending on the bullet used and velocity, flight time will be 0.1 to 0.12 seconds for it to cover the 100 yards. So at 2 mph, that would mean that the bullet impact 3.5-4.2" farther back than the point of aim
Maybe you think the hog is moving slower, say 1.5 mph, or 26.4 inches per second, then the bullet impacted 2.6-3-2" farther back from point of aim.
Here is the last frame of video as the video was just starting to distort (see bottom of screen has gone gray), so this is pretty close to the exact split second of when the shot happened. You see the point of aim. So the point of impact will be roughly about where the right crosshair starts.
Looking at the image, the shot will be about vertically mid body, back side of the shoulder, maybe going through the shoulder blade or possible under it that far back. The bullet entered the rib cage. There will be less damage if it passed between ribs than if it took out 1 or 2 ribs before passing into the lungs (wish rib shrapnel if it hit rib). The shot should be well above the heart and most likely going through the lungs, but maybe lower/rear lobes of the lungs. The shot is going to be below the spine. This will be a fatal shot, not immediately fatal and potentially not incapacitating physically, which turned out to be true. That is because there was no significant CNS involvement beyond the hog apparently being stunned temporarily. If only the rear or lower portions of the lung or lungs was damaged and the lungs not immediately filling with blood because of the area of damage, the hog may live for several minutes.
This same shot, made in the same way on another hog of the same size, might result in the hog going down and not recovering even temporarily.
Sniper John can correct whatever assumptions I have wrong for a better interpretation, but that would be my best guess given the information at hand.