When he asked the last question, Shimizu’s eyes was telling him that he had “fall.” Before death, his mind still moved towards killing Aiko, Hajime thought Shimizu could slightly change his way of life because just like the time when Hajime almost fell, there’s Yue’s existence that was capable of holding and retaining him, so… he questioned Shimizu with that thought in mind. If that was so, he had consider to give Shimizu a chance by putting into him a collar and letting Aiko take custody of him. However, even before death, Shimizu’s eyes didn’t even show such sign.