That is because the devils are us. You shall see why, soon enough.

[He steps back, staring at Combeferre again, as if he's checking his vision again. Yes, it really is him. And yes, he's going to have to explain the whole death-arenas-murdering-people-evil-government situation to him. It isn't going to be easy.]

Come. Let me enjoy our reunion a moment longer before I ruin it with the hideous tales of our plight. I've not see you in ages. I've not seen you since...

[Since just before he'd been shot and the world went black and empty.]