I actually had this idea in my mind that Bruce's men would be other Robins/Nightwings that came after Jason. Maybe a B39 member or two. But it was never appropriate within the story to bring it up, so I left it out. But it's why none of them are concerned about Bruce turning on them/he's not worried about them outing him about the unlawful imprisonment going on.
Clark is a lucky man that he's resilient to harm more than the average man, though I would also imagine the blow was a bit restrained so as to knock him out without turning his brains into applesauce.
