Uncles. (The Witcher 3: Wild Hunt)

Good day.
I came to celebrate Uncles, when the fortuneteller in the center of the circle prays with the crowd, and I have to kill every stench around. In general, I normally kill monsters, in the water, they don’t get into the circle, but I can’t kill people so that an arm, leg or just a drop of blood does not fly off into the circle. All because of this soothsayer, who rushes at them and they run to him in a circle. Tell me, please, how to kill these warriors outside the circle, so as not to fail the invocation of the spirit? Loaded already 8 times, Aard doesn't help either...