Shiro did not believe that for a second. He knew where this sword had come from before it had ended up in his care, and it certainly hadn't been in the hands of a brat.

"Now I know you're lying," Shiro said as he shouldered the sword, "This sword currently belongs to me, and before me it belonged to a temple. Now, if you want it when I'm done with it, then I don't really care. It's all yours. But until then-"

And then he took off running down the street.

He didn't have his guns or any of his other weapons, and there were very few aria verses he could use against a half-demon. So, running was a better idea.