Samuel's surprise was expected. After all, he was essentially telling him that the people of this building turned into magic creatures. It was insane, and if somebody else had been telling him all of this, he'd have ignored them for being insane. But he knew it wasn't.
"I'm not sure about the cause, but I believe that even if it isn't scientific in origin, the way it expresses itself is. So the change could have an unknown instigator, but the change manifests in the promotion of different genes that cause the outer changes." But the inner changes? He couldn't explain.
At Samuel's question, he tensed. He remembered Griffin's voice, the scorn, the disdain. His muscles clenched and for a moment he paused in his tracks before moving on. "I am...not exempt," he said simply.