I have just read tihs blog post. I'm a bit late. Anyhow I call it "peacock". At least that's how my Shadow Yoga and Battodo teacher called it. Although I have not been practising Shadow Yoga for a while, I am still able to do it :-)

Some videos of him (You can see him doing 'peacock' in the first video):

As yoga practitioner, you might have seen this one :-)