[Maybe it isn't Rey's place to say anything. This sounds like a subject that should be up to Carlisle whether​ or not he wishes to divulge the details, and that's why she didn't share his identity with Maketh when warning her of Shadow's conducts. But this is different.]

Well, you are right. He was being forced to stay at one of the temples when the city was covered in fog and going to Hell, because it was "safe" there.

[Seeing how close these two are, Rey is at least pretty sure she doesn't need to explain why this would be such an issue. Even without sharing any religious beliefs, Rey and a few others had seen not to seek refuge at the gods' temples for their own reason. That was their choice, and no one had​ any right to make it for them, Carlisle included.]

When things got violent, Carlisle just made Shadow leave him alone. When Shadow found out, sounds like that's when he burned down the garden.

[Rey sighs, her tone growing darker:] Being under someone's control is shitty, but as far as that situation went, Shadow was doing the same fucking thing by trying to force someone against their will. Chances are he doesn't see it that way, because Carlisle sure as hell didn't.

He was afraid when Shadow was trying to make him teach how healing works. Told him that Shadow can go fuck himself.