sotc
Dormant hero!!
And because you ruled out leaving a fat tapered hinge because of the rot, Would a small face in the direction of the snag's natural lean, followed by a back- cut parallel to that have been in order?
Predicting that the tree was not going to follow your face, but continuing with a back-cut that was intended for a different direction is not right.
Good question. Obviously in a residential scenario you wouldn't continue with the back cut. In the woods, I guess it would depend on many factors. I will patiently wait more experienced input