A large extremely bright white light caught my attention through a glass window out of no where. it seemed to be getting closer and made me feel extremely uncomfortable, so i stood up. the light blinked off really quick to a very faint green light while simultaneously moving quickly, looping around, and back and forth turning back on the bright light several times. i filmed it at the last second. the light in person was extremely bright. not a spotlight. the aircraft was moving exceptionally quick with sharp turns with no meaning, almost like fighter jet pilots do tricks in the sky, like fooling around. it happened to be over a large vacant island with no human access whatsoever. it disappeared with no trace of the green light again.