That's why he had taken the heavy decision to move first and fly south-if nothing else; his experience had given him ample proof that letting the enemy strike first would often be painful, if not outright fatal. Jon knew the possibility of any of this happening was slim, but it existed. This uncertainty infuriated him beyond words, as he often went through the worst-case scenarios in his head. It was only due to occlumency that he could keep his face impassive and ignore his anger.