[No, Saul can tell she's pretty serious. Even if she is still joking a little, he gets it.]

But you're Batgirl. Even if I were a supervillain, wouldn't you be able to kick my ass up and down the street anyway? What does having your number have to do with anything?

[There's a pause, followed by a smile.]

Unless you think I'm a supervillain who likes to make prank phone calls, in which case — [He holds his hands up.] You caught me.