Just to help from earlier on. And sorry if you aren't agile enough to move from instant death from manual carotid pressure, a strike, a neck lock,
or collapse from pressure to the carotid when shaving. Most people would see the link to the overall sensitivity of the carotid, but not you obviously.
Bernard Knight: Lawyers Guide to Forensic Medicine pg 214
'Carotid Sinus'
'This is a common source of death in pressure on the neck, especially in manual strangulation, and can occur INSTANTLY when the neck is gripped.'
'In martial arts and self defense
Stimulation of the carotid sinus via a slap or a strike, to induce (usually temporary, but sometimes lethal) loss of consciousness is a theatrical self-defense technique, and is often taught in martial arts such as karate."
My experience with that was a single hand grip to both sides of the carotid sinus
Even in shaving for the elderly can cause a collapse:
https://www.ncbi.nlm.nih.gov/books/NBK537223/
"This sudden decrease in blood pressure can cause syncope, which often presents in patients who have a history of syncope while shaving or buttoning their shirts, activities which cause increased pressure on the carotid artery."
Like the above the 1933 paper on carotid compression has also been placed here earlier where neck holds were banned for law enforcement officials after instant death experiences in subduing suspects.
Don't hesitate to repeat anything 'wearily' because it's clear you can't help yourself and that it is something you love to do.
Just a reminder which I'm sure you don't want. Get anywhere with the vulnerability of a person shallow breathing having pressure applied to their necks? Or indeed why there was internal bruising only on side of Grace's neck. I won't bother you with a third one as you've been stuck on these 2 for days.
No need to write another book, yes or no will do.