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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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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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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Thea has been tossed to the floor, blanket and all. It's not a surprise, as Sara was able to break free from the wall in chains, taking with her a good chunk of brick and mortar. The woman is stronger than she ever was before!
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Oliver and Laurel find Sara, caught in the act. Will they be able to stop her from doing more harm to Thea?
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Oliver and Laurel are getting their grievances out in the open. Laurel looks like a little girl, but she's a big girl now and should be able to take it like a woman. She knew it was wrong, or she wouldn't have kept the secret from Oliver.
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And here's where Oliver tells Laurel he's more than a little bit unhappy at the current situation that has been kept from him about Sara. Right? Come on. We can read that face!
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Given the looks on their faces, it might have been Sara who send Thea to the hospital. Was she trying to satisfy her bloodlust? That would certainly make sense.
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Arrow Quotes

Do you know why I always blame myself in situations like this? Because at least it's an answer. Sometimes we just need a reason when a situation is completely unreasonable.

Oliver

Laurel: Helena, you don't have to do this.
Helena: Yes, I do. Because once you let the darkness inside, it never comes out.