What did Beaver tell peter about the witch to prove that she wasn't a human?

Beaver explained to Peter that the witch was not human because she had a unique, unnatural way of behaving and interacting with the world around her. He pointed out her ability to cast spells and transform objects, which were beyond the capabilities of any human. Additionally, he mentioned her coldness and her lack of genuine empathy, which further distinguished her from ordinary people. This evidence helped Peter understand the witch’s true nature.