Sean wouldn't know what a "follow up" question was if it bit him in his arse.
That would take intelligence beyond a goldfish's.
Hannity gets a few shallow concepts and words (often they are correct ones) in his mind but doesn't really understand their depth, breadth, and implications. He parrots them, but can't really have any synthetic (i.e., synthesizing) interactions regarding them.
It's fine for the low-information, low-intellect crowd, but he looks like a fool to anyone who is actually knowledgeable and intelligent.