It explains a lot, and yet, it leaves a bitter taste in Otto's mouth. The reasoning doesn't undo anything, doesn't justify anything, doesn't relieve the tension in the slightest. By trying to squash the image of his old self with force, Norman became that old self and there's something so tragic about it. It's a cycle.

"Oh Norman..."

Maybe the tone comes across as disappointed, but what he really is is exhausted, with a touch of helplessness. He doesn't know what else to say. This isn't the sort of thing he can fix. There's no antidote, no scrap of buffering technology, no quick cure. He'd suggest that Norman get proper therapy, but he's not sure that's an option around here. In the end, all he can really do is keep sitting here with Norman- keep an eye on him and keep him out of trouble.