[It's considerate of Zelos to try, but that won't work until he has a little more gravitas about him, and is not injured near a half-elf.]

[Yuan turns the blade in his hand over till he can offer it to the guard hilt-first, very clearly nonthreatening.]

I work here. In the library.

[He nods down the hall, indicative of the direction whence he came.]

I heard shouting and bladework, so I came to find out what was wrong. You're welcome to interrogate me all you like later, but you should see to your charge first.

[And he's telling a guard what to do now. Yuan bites an oath down behind the same flat, neutral face. He never has learned, apparently.]