couldn't he just "borrow" a fragment of feru's claw or fang, turn it into a knife/needle and use that? You know he'd be more than willing to offer it up if it meant dragon meat x.x needle would work great for creating a small puncture wound to drain the blood, just hit the vein and keep it open. After that you could use a weakER material at the inner lips and such to slowly carve away at it, piece by piece.