Cut it off and mod it to have a ball joint neck I think. Although I too would like to know if that's not the case, as I need a Fallen with head articulation.
I didn't like him, so I put him on ebay. Wasn't all that happy with the somewhat robot to somewhat aircraft transformation.
I like him. The only issue I had was that the ankles separated easily. A little nail polish later, and problem solved. Very articulated and nicely detailed. Definite thumbs up.