It's highly likely that Koro could snap him in half. Sizhui's small, lean and lithe-muscled, able to handle himself in many situations, but if this were to suddenly go sideways? There's no chance he could get away fast enough. Thankfully, Koro seems like he doesn't want to harm him, and when he withdraws, Sizhui does the same, wide eyes blinking up at him.

Then he laughs, an actual, wholehearted sound and he shakes his head. “I suppose that is my fault, yes.” He pulls away further, enough so he can bow his head. “Forgive me, ah... I don't think you said your name?”