[She gives him a look which says she's not up for snark right now, not when there's a dying creature in front of her. She moves in closer, if not cautiously and the unicorn continues to speak although its words are pained.

Like it might as well give up on the life it was clinging to and explain itself.]

Meat... could only taste meat. Gave me strength. Females best... animals ran out and through the eyes of the human man saw... you... alone... following.

Warm...

Yeah. That didn't turn out well.

... I'm sorry it had to come to this, but I didn't want to be eaten. And I'm sorry I can't do anything to help now. [To Charlie]

I'm guessing from what it's saying, we can conclude it ate meat since whatever unicorns usually have, we don't have it on our side.