Headsethair, I didn't explain that very well. From a low hover, start climbing at an angle that appears to put the nose just over the top of the obstacle, & then maintain that angle. I agree with you, forward movement requires less power than a completely vertical climb, since you get some wind through the rotor system, & might get translational lift by the time you clear the obstacles. Obviously, as others said, I'd prefer to reach translational lift, and higher airspeed while in ground effect, then climb over the obstacles, but I thought the point of the thread was clearing obstacles when this isn't possible. There may be times when only a completely vertical climb is possible, but this is rare, or at least should be.
Some posters seem to be worried about engine failure to the exclusion of everything else. I tend to consider all the things that can go wrong, & try hardest to deal with the most likely thing. While trying to clear obstacles, ISTM that hitting the obstacles is more likely, & more dangerous, than an engine failure. I could also worry about losing a rotor blade, or any number of other failures, but I try to deal with the most likely things. Maybe it's a matter of personal history, but in over 30 years, I've never had an engine failure, but other things have failed.