Jonathan turned, staring at the man who had spoken, before snorting. "Mr. Wayne," he said softly, pushing his glasses up his nose. "Fancy seeing you in a place like this. It makes one...wonder."
Jonathan wasn't a stupid man. Things added up a certain way and reality inserted itself. Bruce Wayne returns, Batman appears, Batman gets injured, Bruce Wayne has an...accident. He gasses Batman, Bruce Wayne is 'sick'.
No, Jonathan was a man who could add two and two and get four. Not that it mattered. He didn't really care what Bruce Wayne did in his spare time, and so long as the man decided to run around in a cape...he got his dose of fear he so desperately craved.