He is gone.
I found their responses really interesting, because he’s been in all of their lives (bar Emma) for almost as long as they can remember. He’s been help and hindrance, target, motivation, enemy, lover. He was the most powerful monster they knew in many cases. He seemed indestructible, unkillable, and undefeatable, and here, this powerful creature has just sacrificed everything he could, to ensure they were safe.
I think my favorite is Charming’s face. Charming knows a hero move when he sees it. Charming understands every little bit of what that man just did. To him, it is an honor, a privilege, to die for a noble cause like that. He’s tried to sacrifice himself that way a couple times over now and he’s always come back. All of a sudden Charming is confronted with a scenario where someone else is doing it, but there’s no good escape from this death. He gets it deep down in a way that not one other person there does.