Undercut the lower limb at the v standing on the uphill side. Might get lucky and it rolls off with the first cut. I can't see the end of the upper limb but gravity always wins. If it doesn't come off , keep undercutting until you get to the wall. Cut shorter pieces as you get closer to the wall it's likely going to slide towards you. It's a lot easier rolling something off when it's on a wall then jammed in the dirt.
Forgot to mention, If the upper limb is being supported by the lower limb (not hitting the ground) cut as much of it as you can going slowly cutting small pieces (Don't cut over shoulder height). The less weight the better.