If you can find any, which I dont recommend, watch another real shooting frame by frame. The same thing almost always happens, you almost always see blood behind them first, if the bullet goes through them. Also, it looks like an exit wound because it’s such a high caliber passing through such a dense area. Your neck has very little empty or loose space, so that the impact creates a momentary explosion of air inside of it since the air in front of the bullet is being displaced so fast.
I agree with #2, but also use a moment of logic for a second. Blood splatters in the back because a small and aerodynamic projectile literally forces it to. If you’ve ever thrown a rock into water, you know the water moves back in the direction the rock came from (the splash). That’s because the rock doesn’t break through the other side of the water. If you throw a rock through a waterfall, the water doesn’t act opposite of the rock, it will splash WITH the rock on the other side of the falls
Yea, the difference is that your hunter buddy is probably recording at a higher frame rate per second. A 30 fps video, which most smartphones default too, is much more prone to that kind of thing. Maybe look around for hunting videos that are recorded from a small distance with a smartphone at lower fps. Ideally in the snow so you can see any splatter. You can see it do the same thing for yourself if you go frame by frame.