So the man was intelligent. With what Strange wanted to do and how he had gone about it, Solas had been seriously doubting how sane the man appeared to be. The retelling is close enough that he nods in agreement. The details of what happened as the empire crumbled were irrelevant now, it had happened so long ago.

"You would have to ask the Tevinter Imperium, that began the enslavement of the People and stole what remained of their magic," he remarks dryly. "You awoke me from my sleep."

Because surprise, sealing away the rest of the pantheon and creating a barrier between physical and magical makes someone very tired. Several thousand years worth of tired.