If I am not mistaken that 180 degrees turn is called "the impossible turn"
With engine failure at 50 feet he couldn't have turned back, so he made it with the last 5 second of engine life.. Did he forget to open the fuel valve? Or it was really empty tank? I heard of a similar incident many many years ago where the pilot forgot to open the fuel valve after the fuel check (don't remember the procedures on small aircrafts) at the holding point. So he took off and after 2 min he found himself without the eng and made an emergency landing.
Then during the investigation it was proved that he used just the fuel remaining in the from the valve to the eng.