The question remains unsolved, why have a very low power setting at normal RRPM at about 300' with a deliberate very high nose attiutude and a normal sounding engine?
Because he did a quick stop flare? I think FH1100 has it spot on. IMO, that was an attempted quick stop to OGE hover, except the pilot is too late, and then too abrupt with the collective. He's got the collective close to the floor during the flare. When the airspeed is gone and he finally starts raising the lever, the helicopter is already descending vertical + backwards. Now engine power alone is insufficient to stop the momentum -> overpitch (full throttle, 29" MAP).
The recovery attempt in the end (nose down) is too little, too late.
The MAP tells us that he couldn't have been much higher than sea level. I bet with smoother control inputs, that machine would have hovered OGE there just fine.