This same someone, along with his son and several neighbors, in the summer of 1977 at dusk, near Castle AFB in California, saw a disc much like this one three houses away from where he and his son were moving from the car to the front door; it was slowly cruising over the rooftops of the neighborhood. It, also, zipped away like that, into the sky, where it seemed to take the same place as a star ... the folks in the 'hood who'd seen it watched the star for quite awhile as the evening grew darker ... and finally went inside and to bed because standing around outside watching a star wasn't cutting it.
Watching the video over my shoulder right now, he said "Yep, that's just the way it moved -- zip -- you turn your head and you miss it. It's like these things could go anywhere they want in plain daylight, and move so fast that people think they're crazy for seeing them. They turn their head and they miss it."
This someone is well educated, happens to have been tested to have an unusually high IQ, is technical, technological, and very close to aviation; he knows and knew very well that conventional expectations with regard to known physics would require a sonic boom. He also knows what he saw, and that no sonic boom occurred. After realizing that he either had a) to deny his own eyewitness or b) to accept that knowledge of science and physics is incomplete, he finally chose option B and went on to be insired by the fact that the truth is, we humans have very little idea of what is and isn't possible in the physical realm.
The human organism cannot survive those kind of G forces. The starting, stopping, instant 90 degree turns?
INDEED.
THX.
Thanks for posting.