Preparation is the mark of the greatest leaders.
Military leaders prepare. They run simulations, game scenarios, and rehearse responses for each situation, creating standing orders for ease of distribution and further preparation by troops.
Warriors prepare. They spar against people with different weapons, different techniques, devising and practicing countermoves until they develop muscle memory and reflex.
Pilots prepare. They practice aborted landings, stalls, engine failures, and every other emergency until they know what to do without thinking so they can focus on flying the airplane.
Emergency workers prepare. They too run simulations and drills and rehearse responses for each situation, getting themselves and those they protect ready.
Presidents prepare. They get extensive briefings, establish clear chains of command, have alternate communications channels, and meet frequently with top advisors to predict and plan for possible futures.
Successful people, particularly those with others' lives at stake, prepare, so that when a crisis does occur, they can respond thoughtfully as quickly as someone else could react without thinking, not only to the first event but subsequent ones.
Sec. Clinton prepared for the first debate. Donald Trump did not. She responded. He reacted. She showed she knows and does what military leaders, warriors, pilots, emergency workers and presidents must do to fulfill their responsibilities. He did not, and does not.