Understanding that every move he'd made since they arrived had been to protect her, she immediately put herself in the safest place in the apartment as possible -- away from the windows, and out of sight of the door, but close enough to him that he could reach her if he needed to. But after hearing what he said, and didn't say, and seeing the very real fear in his expression, she was the one who came to him. She put herself right in front of him and gave him a searching look.
What had he been planning, exactly? There was a darkness in him that he'd kept far away from her for a very long time, but she'd recognized it on the sidewalk outside Arkham, and again when he talked about the type of person Doctor Crane truly was. After her conversation with the doctor, Beauty couldn't disagree that the man was damaged, perhaps beyond repair. Already, it was clear to her that he didn't regret what he'd done and wouldn't stop. Errol, though... Errol wasn't like him. She frowned, thinking about the implications of how he might 'discourage' the ones who'd taken her.
"They have to be stopped," she said carefully. "But at what cost?" Very slowly, so that he could see what she was doing and stop her if he needed to, she raised a hand and laid it over his heart. He was a good, good man. Nothing he did or said would ever convince her otherwise. But that darkness in him... Beauty suspected it'd been with him for a very long time, hidden by the ease of the City. She didn't want the good man in front of her to give way to the abyss she'd seen in his eyes before. That was a cost too high.