By the way, the story is quite good too! A short summary by the editor:
1346, the Battle of Crécy. Juan de la Heredia, a Knight Hospitaller, offers his horse to the King of France who is in a bad position. Surrounded by the English,he takes off his armour in a fit of ardour, freeing his movements and his anger. The rage to kill keeps him alive, but Juan is now its prisoner. He starts pursuing a unicorn, as one would follow a dream...