Constantine is reading the writing on the floor. Normally people read the writing on the wall, but Constantine has to work with what he's got, and he gets writing on the floor a lot more often than not.
Thea is worried about what's going down, which is rather nice if we've read the situation right up to now. Of course, she's kind of in the same boat as Sara. Maybe Constantine can do a little magic on her, as well.
Oliver: Over watch, we're on sight. Felicity: Excuse me? Oliver: Well, I thought it was time you got a code name. What do you think? Felicity: It's perfect. Oliver: I was gonna go with Oracle, but it's taken.