The discovery of a lost horse gives Ulfin the opportunity to teach his apprentices the “chivalrous” art of ransom. They will have to bring this steed back to the knight Crao, its owner, only in exchange for a purse of gold which they will of course share with him, Ulfin! Arthur, outraged, returns the horse but without asking for anything in exchange. Instead of thanking them, Crao takes Tristan hostage, just to teach a lesson to these apprentices who have little respect for tradition…