For vertical wood, basically like reaming a binding kerf, as you are approaching the far side of a straight-through cut, and the section above starts to settle down, creating a bind, you can cut back (back-chaining) opening the kerf in bar area and area local to it, then cut a bit more into the bind, then back-bar the bind open, then cut a bit more, and back-bar ... the right progress, you can end up out the far side, not bound tight. Don't pull the chain off exiting the top of the bar from the kerf.
As well, as you get to the far side, you can insert wedges or sticks or a dowel into the kerf, cut out the far side, and when released the section will tip away from the exit side, pivoting on the inserted objects. Said objects can help you move a section of heavy wood off the far side of trunk with a push, sliding or rolling.