In your video what you are seeing, the head jerking backwards, is in part due to being exposed to an external EMP (electromagnetic pulse) and in part, mostly her attempts to cover up what she doesn't understand had happened.
Anyone who hasn't heard about how you could get free cokes out of coke machines with electronic coin/bill counters probably isn't familiar with an EMP and how it works. And without understanding that peripheral nerves have a protective sheathing surrounding them then it would be impossible for them to make the connection how using an EMP device could trigger a response in one person without having any effect on those surrounding them.
If you view her expression from the front you will see that for no apparent reason she immediately closes her eyes, followed by the typical fight or flight response as she pulls her head backwards.
It is like when Rudy farted during the hearing, his response was the 'nobody noticed it" reaction and keep talking, but her response was if Rudy looked down at his chair and then moving his butt as if to reproduce the sound that was heard, but then again he unexplained head movement was seen not heard.
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