[Crowley sits with that for a moment, glowering at the watch, and only partially because Elle has a point.]

You're so young.

[It isn't meant as an insult, there's no condescension in his voice. It's stated very simply, because it is just a fact to him. It's coming from millennia of existence, not the handful of decades that some human adult would have on her.]

I'm quite aware of what I can and can't protect him from, and I've no desire to explain myself to you.

[If she runs off to tell Aziraphale, so be it, but he won't have this conversation while a child that he barely knows.]