Head Block
From AmtWiki
Head Block is a term used to describe when a player intentionally blocks a shot with their head, or places their head in the way of an incoming shot, to protect a limb or part of their body from being struck, so that the head blocker can capitalize upon the illegal head shot & kill their opponent.
Head Blocking was resolved when the saints of amtgard released the new rules that specifically outlined head blocking as an illegal tactic.