He smiled, just a little.

"Fairly certain."

If something could be, then it was, and therefore 'natural'. He made no claim about knowing all things that were and were not.

"I have read about why the elves hate the humans. It is a shame so much is gone. But..."

He gave Morrigan a pointed look, perhaps the closest thing to a genuine expression he'd had in their entire conversation.

"...not everything, it would seem."