My reasoning was that I felt negligent in my duties for not at least attempting everything in my power to do something. It was never my intention to bring harm to the other residents or force anyone to leave who did not wish to do so. Our first attempt was simply meant to find information, learn how the system worked. [But... Ribbons... He had jumped the gun and tried to push his way into Tieria's point of the timeline. It would have ruined everything, and Tieria was almost completely certain that was what caused the backlash in the system.]
I do regret that others were subjected to a difficult situation as a result of what was done, and apologize for it, as I never wanted such consequences. My purpose is to guide others and minimalize negative impact. I had sincerely hoped it would have been simple and that no one else would have experienced negative effects from our efforts. [He really did regret that part. Everything about their plans back home had always been about minimizing casualties and keeping their interventions short. Maximum impact with minimal damage, and he'd failed in that. He'd trusted someone he shouldn't have, and that bothered him, too.]
I am not asking to be able to access the systems as I had done before. I simply... [He hesitated for just a moment, as something like this was really hard to admit.] I am simply looking to regain a part of myself that I lost as a result. [If Sentience blocked his ability to access the computers with his quantum brainwaves, that would be fine. He could still function for the DF on the network security team and prevent others from hacking without it. But, he really did still feel very limited in other things. It was like having all of his senses dulled and almost being in a bit of a blur.
Plus, he had managed to convince himself that, if he'd been even slightly able to use them, he could have prevented Michael from stabbing Neil. And that bothered him the most. With Setsuna now gone, the only one left with quantum brainwaves was Anew, and she refused to use them. Tieria felt responsible, and he needed to do something to fix everything.
The hardest part about doing this was that he was swallowing his pride to even admit that he was wrong about his choices. Being a failure in anything and being wrong was one of the worst things Tieria had to deal with, and it bothered him to no end.]