Oren wrote:
On Thu, 1 Aug 2013 15:16:42 -0700, "Bob F"
wrote:

Please explain why a tree cut to fall one direction, and pulled near
the top in the same direction, would rotate and fall 90 degrees from
that direction.

If the cut is not level across the truck, there is a risk of the tree
spinning off the stump and going anyplace it likes. The rope will not
control it.

If this notch was cut on a slope - the same might happen.

Pic:

http://www.earthwalkthebook.com/blog/wp-content/uploads/2013/01/THE_MOST_UNKINDEST_CUT_OF_ALL.jpg

YMMV

There's a guess. Hardly a logical answer to the claim I was questioning.