There was very little that Kaleeth would be able to do to stop the woman, and especially the little girl, from panicking. She was a giant, blood-soaked monster in their eyes, and there were no rational words that were going to change that image. But, since the pair were hiding in the back of the wagon, Kaleeth was able to slink away out of their sight to allow them to focus solely on Fendros. He was a much less threatening sight, so they would accomplish more if Kaleeth stayed back. 

Even after Kaleeth stepped back, it was another minute before the pair gave anything resembling a coherent response. For much of that time, the little girl was turned away crying while the woman held her protectively in her arms, though she too was horribly frightened. 

Eventually, after a while of not being harmed, the woman mustered up the courage to speak between her cries. "I don't...what viper? I don't know what you're talking about. I just drive the cart. They paid me to drive the cart; I don't know anything else."