It was a good thing that Yukio had stopped them, because Shiro would have definitely responded with something about offering to make Rin bloody. To share the love and all.

He settled for making one more face at Rin before answering Yukio's question. "Some kind of giant eagle-thing. Not completely sure, it came out of nowhere and was gone just as quickly. I already used the standard salves on it, so there's not going to be any poisoning problems."

Demon wounds could be potentially fatal to humans, even if they were minor ones. Shiro would never be so lax as to not treat a demon wound properly.