Do আপনি see Toshiro as a murderer? No, Toshiro wouldn't kill somebody who was weak and was already captured দ্বারা him. He let him go, because he হারিয়ে গেছে all of his power (or at least, হারিয়ে গেছে Ichigo's power), so he just let him go, knowing he wouldn't do anything else bad.
because toushiro is not that kind of person that will kill other people because they are his enemy and the সেকেন্ড one is toushiro has a deal with yukio that if he return everyone in the outside but no one need to die...