Final answer:
The information provided does not include details about Roy or the reason he stopped chasing the boy in Chapter two; therefore, an accurate answer is not possible.
Step-by-step explanation:
In the context provided, there is no explicit reason stated as to why Roy stopped chasing after the running boy in Chapter two.
The various excerpts given for reference from different texts do not provide enough information to determine which text mentions Roy and the situation in question.
As such, without the specific text or further details, providing an accurate answer is not possible.
These excerpts appear to be from different novels or short stories, none of which provide context about Roy or the running boy.