Final answer:
Without the context of the specific literary work, it's impossible to provide an accurate reason why Moody's tutoring sessions with Wayne come to an end. Such endings typically depend on plot and character developments within the story.
Step-by-step explanation:
The provided question seems to be about a narrative or literary situation rather than a concept from an academic subject such as Mathematics or Science. Without additional context, such as the specific literary work or narrative being referenced, it is difficult to provide an accurate answer regarding why Moody's tutoring sessions with Wayne come to an end. In literature, such circumstances usually depend on the specific plot and character development crafted by the author. They could end for a variety of reasons, such as a resolution of Wayne's academic challenges, a conflict between the characters, scheduling issues, or an entirely different plot development. Without the exact context, it is impossible to give a precise answer.