"Both," oh, Emma knew her guilt would sit for a long while, it would fester in there for good long years to come. Even the lives that Emma hadn't taken herself, the guilt from not being good enough, fast enough, smart enough, it had a place in Emma's heart just the same. Actually causing someone's death, that would stay there for a good long time.
But really, she meant the magic. Part of the darkness that had taken over, she felt like it was still in her, which she knew it reasonably wasn't. They took all the darkness they could into themselves and vanquished it. She recalled quiet clearly the feeling of the sword piercing her back through into Killian's heart. No, the Dark One was gone, and all the magic from that particular curse was gone with it.
"I feel wrong though," like something was so fundamentally different now, coming back from death, she'd changed. And maybe it was just the act of dying here, Emma hadn't done it before, not like Killian had, so she wasn't entirely sure if this was what was meant to happen. But she couldn't help wondering if maybe it was the magic.
Arms moving to wrap around Jefferson's waist, hugging herself against his chest to listen to his heartbeat for a moment, Emma sighed softly. "It's stupid to think we could've beat it, isn't it. Using the same thing it does. So stupid."