Tesham Mutna - The Witcher 3

Higher vampires bear an uncanny resemblance to humans. Yet the similarities are only skin deep. We mere mortals have a dastardly time trying to understand their emotional makeup and morals. So Geralt could never have foreseen what happened - that Dettlaff would try to take Syanna's life.
Luckily, Syanna had her protective amulet. Crafted long before by Artorius Vigo, it did exactly what it was created to do. At the crucial moment, the duchess' sister disappeared, transported to a spot both safe and secure. Dettlaff flew into a rage. He lunged at Regis and Geralt, intent on tearing them to shreds. Yet the duel ended with his defeat and, at the last, his demise.

Higher vampires bear an uncanny resemblance to humans. Yet the similarities are only skin deep. We mere mortals have a dastardly time trying to understand their emotional makeup and morals. So Geralt could never have foreseen what happened - that Dettlaff would try to take Syanna's life. Surprised, the witcher failed to protect the young woman.
He could, however, avenge her. He did so swiftly, though not without difficulty and with Regis' help.

Higher vampires bear an uncanny resemblance to humans. Yet the similarities are only skin deep. We mere mortals have a dastardly time trying to understand their emotional makeup and morals. So Geralt could never have foreseen what happened - that Dettlaff would try to take Syanna's life. Surprised, the witcher failed to protect the young woman.
With the deed done, Geralt nonetheless let Dettlaff go. There was no question he was guilty, but it was equally clear he had been both predator and victim in the grand scheme of things. For his part Dettlaff vowed to avoid humans forever more. In his heart of hearts, the witcher knew the vampire would keep his word.

Geralt had done what was required. He could now go to the infamous Tesham Mutna, where he would once again face Dettlaff.

Though higher vampires seem to differ entirely from us, upon closer examination their passions, emotions, prove human to the extreme. Thus, Geralt and Regis quite rightly did not expect the Beast of Beauclair to be pleased as they headed towards Tesham Mutna to meet him. When, unaccompanied by Syanna, they finally faced Dettlaff, the vampire flew into a rage. He lunged at Regis and Geralt, intent on tearing them to shreds. Yet the duel ended with his defeat and, at the last, his demise.