lol, more like just a real hard hit directly to the throat should do it and it's more like crushing the vocal cords.

I mean to kill him? any number of things could do that. Hiccup could strike him down with his sword after he attacked Castiel or one of those plasma blasts from one of those dragons could kill him or better yet- Skullcrusher could fulfill his revenge for his deceased rider and crush Drago's skull ^^