Surely John Constantine is offering to Oliver Queen some sage advice about...something. It it Nanda Parbat where they are or some other location that just looks a lot like it?
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Who goes there?! They sure looks surprised, with the exception of Constantine, who is in his usual stance on the floor.
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Oliver is partially suited up, just like Laurel. Neither are sporting head gear, so they must not have any worries about being spotted or outed while they're out on location.
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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.
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Constantine has a warning for Oliver and Laurel not to move any farther. Are they back in Nanda Parbat? What are they looking for and more importantly, what did he find?
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How cool is this? Black Canary and John Constantine. When worlds collide! Hey, that's going to be the title of my slideshow. Not bad, right?
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Thea and Diggle are listening intently to whatever is going on. There isn't a whole lot of suiting up going on in this particular hour, is there?
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Is the ceremony over? Is Sara saved? There is lot of waiting around going on while whatever happens happens.
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Can you imagine Oliver and Felicity watching scary movies at home, Ms. Smoak jumping into her boyfriend's strong arms everytime something goes bump in the night?
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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.
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Oliver and Laurel are integral to the ceremony. I wonder why it's not Lance in the circle instead of Oliver? That should be interesting to figure out.
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Felicity is in the lair, waiting for things to get started with the restoration. Odd that the title was already taken for another episode and Constantine is using the word for his business now.
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Arrow Quotes

Oliver, sometimes the greatest act of love is no action at all. It's her life. It's her choice.

Malcolm

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.