There's a pause as Strange gets off of the marshland onto the smaller road. Gingerly, he sets Bell down. When he speaks again, there's a surprising serious tone behind his words.

"I think the dragons are more than just a nuisance. Multiple small things have happened to me recently. They were seemingly unconnected except for one common thread: the dragons."

Finding that scale while researching. His courier falling apart and gifting him what Strange assumes to be Logistykon's scale and Logistykon's power. That mirror he found, one that showed the unenchanted form of things, which showed him with a scaled face. One would have to be mad to overlook all of that.