Watch his first movement realllllly closely.
He begins a 360, but just before he completely rotates the 360, he throws his head to the right and does a barrol roll.
So, it's pretty much a 360 to late barrol.
Aaran has done these before and he said he starts spinning then drops one shoulder to flip then drops the other to keep spinning around which would make it a 180 to 180 barrel, 3 late barrel or how ever you want to put it