Can’t kill Morvudd in the Missing Son quest in Witcher 3

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I can't kill Morvudd in The Missing Son quest. I manage to bring him to zero health (after which my hits do zero damage), but he doesn't die.

I use Witcher 1.07.

Best Answer

This turns out that to kill Morvudd you can't be under influence of Cat potion.

Detailed information (has minor quest spoilers):

Morvudd is scripted to hypnotize you after his health drops under certain threshold, after that he runs to his lair. Cat potion (at least enhanced one) blocks hypnosis, so he can't run.