[If this was via text, he might've responded something to the effect of it being uncertain that they ever will find exactly what's at work on them revealed. It'd be for the sake of trying a nudge toward hopefully-productive conversation, and he doubts his ability to be nearly that productive for now.

After a moment, mutters up:]

Is - there -- ...anything you're wondering - by the way? [Swallow.] I've been uhmm... involved in this since last April -- I could - try telling you some of what I've seen...