Harry Potter and the Philosopher's Stone2001

Firenze Harry Potter, you must leave. You are known to many creatures here. The Forest is not safe at this time, especially for you.

Harry:
But what was that thing you saved me from?

Firenze:
A monstrous creature. [indicates the dead Unicorn] It is a terrible crime to slay a Unicorn. Drinking a Unicorn's blood will keep you alive even if you are an inch from death, but at a terrible price, for you have slain something so pure, that from the moment the blood touches your lips, you will have a half-life. A cursed life.

Harry:
But who would choose such a life?

Firenze:
Can you think of no one?

Harry:
Do you mean to say, that-that thing that killed the Unicorn, that was drinking its blood... that was Voldemort?

Firenze:
Do you know what is hidden in the school at this very moment, Mr. Potter?

Harry:
The Sorcerer's Stone.

[Hagrid, Ron and Hermione appear]

Hermione:
Harry!

Hagrid:
Hello there, Firenze. See you've met our young Mr. Potter. You alright there, Harry?

Harry:
[nods] Mm-hm.

Firenze:
Harry Potter, this is where I leave you. You're safe now. Good luck.