The command input for this move is d/f+2+3. During the animation, Heihachi will grab the opponent on his shoulders and then damages the opponent with a quick but powerful headbutt.
When to use
For a character with a lot of over-the-top and powerful moves, Heihachi's Fire Starter is one move that can truly annoy anyone who's ever caught in this, especially since this move can be spammed continuously and breaks the opponent's defense succesfully. One should be careful in using this move though, as if the throw were to be broken, Heihachi will suffer from an open disposition.