assuming the guy in your pics was in pursuit of that frisbee:
unless the other 'guy' was pulling a mad ivan, why weren't his wings swept ?
See, this picture demonstrate one of my (many many) problems with Unidentified Flying Objects being extraterrestrial craft. With our hundreds of satellites with optical capabilities, and the thousands of professional telescopes and observatories here on Earth we probably have every square inch of space for a thousand miles out under constant visual surveillance. Yet none of these folks with their high resolution cameras can ever seem to get an image of an alien craft as it approaches Earth's orbit. It's not like the flying saucers can sneak up on us from around a corner, we have a pretty wide open field of view.
The most obvious response is that the aliens have superior stealth technology that hides them from view. So why is it then that the stealth technology falls all to pieces when faced with some farmer's blurry Polaroid?