Looks like the lack of climb says power was the issue? It certainly looks like he didn't have enough available, either a mechanical issue or being overweight, but he was obviously trying to get it out of there.
The left yaw reminds me of a technique I've heard a few guys talk about, letting out some pedal and flying out of trim to get a little extra umph of power that would otherwise have gone to the TR when trying to clear an obstacle. An old huey guy told me he used it in Vietnam, and still finds times it helps out when his 205 was a bit heavy coming out of a dipspot. Maybe that explains the left yaw in the video?
-Mike