"Oh... uh..." It's not a question she's really had to answer much. In fact, it's not one she's even bothered to ask, but then she'd kind of fallen in with the team more than joined it.

What would Ava say?

"Well, there are things out there that try to mess with the timeline and if they mess up enough, they can really mess up the Earth or even break time and reality, so our job is to look for these time anomalies so that we can prevent that from happening." A pause. "Like one time, the Greek fates enslaved all of humanity, but I bet you don't remember that, because we stopped them and free will prevailed."