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.
Did you ever imagine Felicity Smoak and John Constantine floating in the same worlds? She's all pink and fluffy and he's all khaki and grizzled. Yet here they are, face to face, trying to accomplish the same goal.