I'm guessing that
this thread was made by your friend
As for what happened. Only explanation I can think of is: 1st gear is sometimes jerky. If you let off the throttle a bit in first gear while turning, then it's possible the jerkiness caused the front wheel to loose traction. The front wheel may then have turned fully in one direction, then suddenly regained traction throwing you off.
If that did happen, it wasn't the bikes fault. That would be rider error for having poor throttle control and/or being in the wrong gear for the turn.