"I do think. I more than think." He has no proof, but what is missing in the details of what should be possible does little more than explain Asmodeus' interest - and amusement. "Particularly as they helped you train." For a while, of some indeterminate amount of time. "The bigger question is if they knew and that is why they helped, or it was you subconsciously seeking them out."

He sounds very patient, calm, and composed.

He wants to shake Zerxus - or maybe just scream.

He does at least believe that Zerxus didn't know.

Though how he could have not is beyond Bruce. It seems obvious (from Bruce's position of mostly hindsight.)