I am just guessing now (like the rest of us):
The pilot was well aware of being "on the edge" of power there, so he wanted to keep it short and quick....
He was not able to put full skids on the ground, as the spot he picked did not allow this, so he was trying to balance it on the skids, which at that altitude and which the wind (?) required some power changes in pedal and pitch...
He ran out of left pedal, and the helicopter started to turn.....instead of lowering the pitch (and risking to have the helicopter start sliding on the ground), he increased it, making it worse...
When the helicopter started coming around he probably had the pitch already all the way up under his arm..........easy to say what he should have done now, but once you´re in the cockpit, we all know that a decision has to be made in a split of a second.....this is where experience kicks in.........