[The way Sherlock warns her, reassures her that if something happens he'll see, implies he'll do something--that scares Molly as much as anything else she's seen in Luceti, from the wings to the magic to all of it.

Sherlock's worried. Honestly, genuinely worried, and Molly has to fight away the urge to shiver.]

All right. [Even if she's afraid, what else can she say?] I promise Sherlock.

You'll do the same, right? [She asks because that's the sort of person she is, but she shakes her head a moment later.] No, probably not. But if you did, I'd see it too. And I'd tell someone. John or Lestrade. You know that.