Gord named it I believe. I think it is a mismatch with a snipe.
Yes, its exactly that.
Being sure that your confident in being able to effectively undermine the center of gravity. Beauty in vertical conifers.
I dog in and roll a quickly aimed gun where I want, and undercut the COG. Because you aren't fighting the bending of a hinge, you need less undercut than if you are trying to saw lean into the log with a normal face/ hinge. If you see you are deep enough that its sagging, Stop. Be aware of barberchairing forces. Doug-fir can be cut deeep, IME. Be careful with maple, alder, etc.
Cut a diagonal (my preference to rest the saw in the wood and go with gravity. Also, it blows chips down, rather than up. I probably do it both ways, truthfully). I cut deep, leaving a full width dutchman/ kerf about 1" deep.
Come in the backcut below the first horizontal kerf, like with a bore-cut/ back-strap release cut.
Tips right over. The snipe/ kicker directs the log to a good degree, like a face-cut. Saves so much time and groundie resources. Usually snipes/ kickers are used in logging with humboldt face, in this area. I don't know that it matters much for my purposes, or at all.