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Goro doesn't bother to chase after her at top speed: she's not moving fast enough to hurt anything. He instead walks after her, her reaction bringing to mind how things had been a mere six score years ago...
Eventually arriving beside the little creature's hiding spot, he lowers himself until his eyes are about on-level with hers, and offers his sword-cleaning cloth: he doesn't catch cold frequently enough to carry a handkerchief.
"You've lived... apparently as long as you can remember... in a place where people find it hard to care for themselves, let alone a little girl like you. Your looks don't do you any favors, but trust me when I say that a normal-looking child wouldn't find it much easier."
A brief cloud passes over Goro's face, but he presses on.
"It does not mean you are unloveable. It does not mean you are a monster. You are just a strange little girl who has made some mistakes. And here, in the Seireitei, that can eventually be overcome. If you will listen to me, I think that you can find a family. After all, Nasumi-san did. So did I."