Hiiro learns the magic spell of the Kokuu blade, a weapon which will strike an enemy from afar.  Hiiro is far too terrible a swordsman to put it to use, but Master Theo notices that he has incredible power.  Theo realizes that not only is Hiiro keeping Dagan Zot's heart in check, Dagan Zot is the only thing keeping Hiiro's heart from going out of control...
Otherwise a human would be unable to 
bear the power of the dragon's heart.
وإلاّ ما كان إنسان ليتحمّل قوة قلب التنين
Das Herzen dieses Drachen wäre
für jeden anderen Menschen zu viel.
Si no, un humano no podría tolerar 
el poder del corazón del dragón.
Si no, un humano no podría tolerar 
el poder del corazón del dragón.
Sans ça, aucun humain ne pourrait
porter le cœur de Danguard.
Tuttavia un semplice umano non potrebbe 
sopportare il potere del cuore del drago.
De outra forma, um humano não conseguiria
 suportar o poder do coração do dragão.