As pointed out by Paul, once you overpitch the 280FX, you suffer a greater power loss than you think, plus the lack inertia in the rotor system it's not just the blades.
The whole thing started far earlier as pointed out and making another approach from a different direction could have all the difference.
From experience a slow orbit over the site to suss out the wind direction would of helped, at least he is safe and here to tell the tale.
Lets hope others benefit from his mistake, fly safe.
