This split requires not only mobility in the shoulder, but also flexibility in the hamstring.
Learn the Double Elbow Jade with the legendary Natasha Wang.
Learn how to get into a one arm handstand from a Frog with Terri Fierce. You really want to make sure that you have a strong core so that you don't wobble.
This Intermediate/Advanced move is even more dramatic if you have a lot flexibility in the areas of the low back, shoulders and hips. It is also more visually beautiful on a spin pole. Do not Shoulder Mount dismount unless you are already very comfortable in your Shoulder Mount.