He looks surprised that he was even thinking about it in the first place.
He looks like he just realised the biggest, most simple truth he’s ever known. Like it’s something so deep and all-consumming that he managed to not notice it for some time, but that’s only because it was there all along. And that makes sense. Because his rebellion from Heaven began with this. This was his biggest motivation to walk into everything that happened afterwards. And it will break through his very nature, because it’s bigger. Stronger. More important. It was the first thing Castiel had ever wanted for his own.
Like everyone else, I’m just waiting for him to say “I need you too”.
A character has something he believes in more than anything. A person he has sworn to protect, an ideal he’s sworn to uphold. He might have spoken that vow in a sacred ceremony, or simply made a decision in the silence of his heart, it doesn’t matter. What matters it that no matter what, he will not break it.
And that, essentially, is the core of this trope – a character-trait so important to the character that he will break free of outside control or amnesia to keep it.
Simply having a vow will not suffice, if it has not been ‘tested’ in this manner.
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