Guide him with incentives.
Little Mike is your best assistant!
You must not harm him!!!
Thus, the third letter also came to an end.
...
It was apparent that when Mike Smith wrote these contents, his emotions were in an unstable state, causing the three pieces of paper to be tattered with frequent scratch marks. But the content was still coherent. To summarize, there were two points.
First, the Source of Pain was a toy Mike Smith created out of some perverse desires, which eventually backfired on him. This matched what the female member Dean had burned to death had said earlier.
Second, Little Mike was a genius with emotional deficit disorder.
Dean twisted his somewhat stiff neck. He had become somewhat interested in Little Mike. But the urgent matter at hand was not to give the Source of Pain members time to react, but to wipe them out directly!
Dean tucked the letters into his breast pocket and looked at the map beside him.