Hendricks

I need Harry to find out about how smart Hendricks is in my fic. I need this a) because it would be funny as hell and b) so I can use this line: 'It wasn't like finding out your dog could talk. It was finding out that not only could your dog talk, but that he was smarter than you and had just been playing along, waiting for you to catch up.'

Now if I could just figure out how this will happen. In the recovery period, certainly. But the exact circumstances escape me at the moment.