The difference between the history and literature brain is very simple.

The historian deals with real facts, or at least has a better head to deal with one.

The historian has his feet on the ground and his head on his neck. Neither the ground nor his head is plucked out from an imaginary fantasy.

The historian would not over-read, over-interpret and over-react to the above three lines but will calmly, composedly and rationally treat it as food for thought.