system
Given the following post, respond as if you're commenting on Reddit:
human
[Angel] When Angel first rose from the grave, why was there mist coming from his and Darla's mouths?

In the scene where Angel first rises (The Prodigal, S1E15), Darla and Angel are in a cold graveyard. There's mist coming from their mouths, but why would there be if they don't breathe? It's not just when they talk, so why would they be breathing if they didn't have to?

Angel, maybe because he's fresh, fine. But why would Darla breathe?
gpt
Vampires don't  *need*  to breathe, but they *can*. How else could they talk? They require the ability to suck air in and out of their lungs in order to help them masquerade as normal humans. All vampires clearly breathe, despite not needing to for survival. Now, the real question here is this: how did they steam the air when they are not warm like humans? Vampires, though cold, dead creatures, gain temporary warmth from fresh blood or environment.  From this we can fathom: Darla had been eating recently, and Angelus had been a fair bit warmer in his grave before emerging into the cold night air.