UAV != UFO
("!=" means "does not equal")
problem with the UFO's is it's physically impossible to accelerate from 0 to 1000+knots instantly AND do a true right angle turn
not banking becauseof inertia and needing air for lift etc, instead an actual L shaped turn
AND stop dead.

so, no know tech coudl allow that. theoretically i't spossible with some weird antigravity where you are within your "own relative gravity well"
but such tech and power sources would be vaslty beyond our own
so either someone found some amazing leap forward in tech
or it's aliens
or it's something beyond our current comprehension (like seeing things occuring in another universe because of their power source "bleeding through" into ours)

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