Creative Speculation

1. The exposure of frame 312 ended.

2. An unknown time later, a bullet hit the back of the skull at an estimated 1900 fps.

3. Less than a millisecond later, bullet fragments exited the front-right skull at a slower speed, say 200 fps, by blowing out a large section of bone.

4. An unknown time later, the exposure of frame 313 began, in which we see the head has been thrust forward since 312 ended, and we see a large cloud of debris on the front right which includes what appear to be skull fragments as much as six feet away.

The exposure time of the frames is completely irrelevant in this timeline.

And sorry, but whatever you're trying to say about "the bullet taking so long to traverse the skull" doesn't make enough sense to respond to, and the rest of the post isn't much better. So, first, let's see if you comprehend what I'm claiming in that timeline, and if so, do you have any objections that you can express coherently?