Julia might have been surprised if she hadn't already had a good sense of who he was. He had this darkness inside of him and yet he was so concerned for everyone but himself. Still, she chose not to acknowledge it. She had a feeling he wasn't comfortable with his own inherent goodness. Instead, she chose to intentionally misread it. He might be more at ease if she thought his concern was for his own well being. And she could do her best not to call him on it.
"Don't worry," she said gently. "I'm not going to let anything happen to you. If it gets to be too much for you, we'll stop." She wasn't worried about herself. She'd faced worse things than whatever monsters lived in his head.
"I should warn you though," she said. "People who are touched by things like this rarely come out of it unchanged. Even with it gone, you might not be the same as you were." She should know better than most. After all, she hadn't always been like this. And for all the good of it, it had come at a rather steep cost.