A member at the adult climbing club had decided that they wished to lead a 6a+. They had previously been shown how to lead correctly and communicate with their belayer, the belayer had also been shown how to lead belay correctly. This person has some issues with his movement (undiagnosed cerebal palsy). Due to these issues while he was belaying I had the tail of the dead rope so that he could concentrate fully on the belay.

The leader came to a point where he decided that he would make a jump (that wasn't needed) for the next move while above his last clip, he didn't let his belayer know that this was going to happen and missed the move which resulted in him falling.

As the leader took his jump for the next move his belayer was giving out slack because he knew the leader needed this to move up, however due to the lack of communication too much rope was given out resulting in the leader falling approx. 5m stopping around 1m from the floor. the more important part of all this was that due to his lessened mobility/dexterity and possibly his lack of experience he let go of the dead rope and grasped the live rope with both hands. The fact that I was backing up the dead rope meant that the climber while falling further than he should have didn't hit the floor.