Okay, uhm, LOTS OF SPOILERS
Alright so I don’t have this literature capability of knowing if Ella has like this weird special death where it is only described as “temporary”, but the Entity told her she would soon be restored to her physical form, and she’s all like “what if I wanna stay dead?” And the Entity tells her that <i>she</i> would want to stay alive, meaning that Ella is in charge of whether she wants to stay dead.
So what if this 2% chance Pittacus applied the same situation to Eight when the Entity took over his body? That would mean he asked the same thing as Ella did, except he fought to stay dead. So the Entity obviously knows what Eight wanted, and granted it. Which also means that Eight, not the Entity, is in charge of whether he wants to come back or not.
Now back to the “You’re so warm” scene. From what we can tell, it’s clear Marina wants Eight back. And if the same situation above was applied, Eight feels he’s better off dead. As Marina is still living, I don’t think the Entity can get in her head and see what she wants. If this is true, then it was Eight who wanted to see her, even if it meant being alive. (Even if it wasn’t true, Eight would probably still have to agree to it.) Also note that when Eight was brought back he landed straight in front of Marina, and then opened his eyes.
So basically, in other words, if Pittacus wasn’t so unbiased towards Eight, <b> Eight would give up life or death to say that goodbye to Marina.