A hormone trigger. I'm enchanted with Jamie's restless desire ( stalk, mind-fuck his secret lover who's in copulation with a woman, leave in a flurry, but no, return and scrape against meadow and masturbate to put out that frenetic desire) and his violent jealousy (cut lover's throat when he's smiling to another man, like a whore, what a betrayal)
An act of love without the need for thanks. A gift which was not given as a debt implied. But you never saw his bravery. Never felt the warmth of his selfless compassion. That is the spirit of Christmas. But you were numb to him, lost to all affection. In the end, love cures.