"I...did and I didn't." Pain there, in blue eyes and he's looking down, ashamed. Abandoning the cleaning to come and sit on the bare mattress, elbows on his knees and head low. "I didn't change my future at all. I'm not sure I've even prevented it from happening there. Goku didn't die in the past when he was supposed to, because I changed it. But the androids there weren't the same ones that decimated my world. Somehow, I altered the past--but I didn't change it. My future still exists as it is."

There is a deep breath in, and out, and it is so easy to see the guilt, the weight he carries. "But," And there's determination there too, diamond hard and clear. "If I can prevent what happened in my world from happening again, I'll do it. Whatever it takes."