Final answer:
Shancho's request to Don was to help him roll a stone which he could not do himself. This task was significant to Shancho who had loved rolling stones all his life and had specific reasons for wanting to roll this particular one.
Step-by-step explanation:
The request that Shancho made to Don which he couldn't do was related to a physical task that involved rolling a stone. The passage suggests a sense of urgency and importance in Shancho's request, as he mentioned his lifelong love for rolling stones and had a specific intention for rolling the particular stone in question. It appears that Shancho wanted to roll the stone in order to cause a significant change to the landscape, possibly to prevent access to a certain area. However, the text implies that Shancho is unable to perform this task, and his inability is causing him distress. His words indicate a plan thwarted and an objective unfulfilled due to his current inability to move the stone as intended.