Final answer:
The question seems to be about a character's near-death experience, but the provided text does not contain information about a character named Westley or a context in which he becomes 'mostly dead.'
Step-by-step explanation:
The inquiry pertains to a moment from Zane Grey's literary work where Westley becomes "mostly dead." The context suggests a physically exhaustive or near-death experience for a character, possibly within a plot involving intense physical and emotional trials. Unfortunately, based on the given excerpts, the question about Westley cannot be precisely answered as it does not appear to pertain to the text provided.