The Trial of Winterfell (джен)

For all the great tipping points in the history of Westeros, perhaps fewer hinged upon one thing more than the day that Brandon Stark fell. When he plummeted from the summit of the First Keep, the future of the realm changed forever. Kings rose and fell. Houses reached the apex of their glory and crashed into ruin. Banners once old and ancient crashed into the mud, only to be raised anew. It was a thing that set in motion wars and coronatons and deaths across the realm and beyond, forever changing the course of the lives of men and women as much as it did the flow of history.
But what if something different happened that day? What if Brandon Stark never fell? What if he saw what he saw, never revealing himself, but descended to the ground, and told his brother of what he had seen? What if Robb Stark had learnt? What if Jaime and Cersei Lannister were caught in the act, and arrested?
What if there was a trial in Winterfell?