Incoherent, as is typical. What do you mean by "bow wave", why do you think it should have happened, and why do you think it didn't happen before frame 313?
When a bullet passes through a medium such as tissue, or brain matter, the displacement of matter ahead of the bullet, just like the bow wave ahead of a ship, causes trauma far beyond the diameter of the bullet.
In the case of the JFK assassination, we know, from descriptions of damage to the brain, that the bullet entered at the point you keep calling "the cowlick", and caused massive trauma, ahead of the bullet's passage, that exploded out of the side of his head.
You keep claiming that the bullet entered lower, and travelled downwards.
You seem not to grasp that areas of the brain you claim were undamaged, should have been effected by the trauma wave, ahead of the bullet, as it passed downwards.
The bullet missing them is not, and has not been, the point, but you refuse to address or explain this anomaly.
How can the bullet pass downwards, without causing trauma to the lower reaches of the brain?
It makes no sense. You can try and deflect, by talking about skull fractures, and the like, but sooner, or later, you are either going to have to address the trauma issue, or stop pretending you are the one who knows what they are talking about with respect to the wound.