The amount of free space available to turn your plane around in the troposphere is vast, but apparently not vast enough for this skydiving instructor and his companion.
"Just afterForest Pullman a skydiving instructor based in Bangkok, and his passenger exited the aircraft, the pilot of the airplane made a 180 degree turn, nearly striking the skydivers. The tandem passenger had no clue what happened until the team successfully deployed their parachute." Mashable
For a more successful skydiving video to calm your fears, check this out.