Don't worry about that, Tohsaka-san. I'm not going to let my guard down entirely around these people...I know they could kill me if they wanted, but that doesn't mean I shouldn't endeavor to be polite, at least.

[...she says this while:

A. Trusting a vampire lady with a very notable distaste for humans like a mother figure.
B. Trusting a guy waging war on humanity with a surprising amount of stuff, jesus christ.
C. Trusts the guy who destroys dimensions with an olive branch and little to no judgement.

Ergo, she's. Uh. Not the best decision maker in the room.]