There's a parable she often uses in teaching, probably a bastardized version by this time. But a king's daughter was ready for marriage, and he announced he would give his daughter to the marksman who could hit the bird in the eye. He set a date for all interested men to gather. But one caveat: if they shot and missed, they'd be put to death.
The first hunter stepped up, aimed his bow. The king motioned for him to wait, then asked what he saw. "Oh," he said, "this is the most beautiful forest in the kingdom." The king refused to let him shoot. The next hunter came up and took aim, and again the king stopped him and asked what he saw. "The tree, in which that bird is, is the greenest tree in the forest," he said. And once again the king refused to let him shoot. And so on through hunter after hunter. Finally a man stepped up. When the king asked what he saw, he replied "I see only the eye of the bird." The king let him shoot, and of course he hit the bird in the eye.
So it's a question of focus.
The hand-eye coordination. Trying to predict where the head will bounce. Keeping her fingers steady. If she turns away for half a second that head bounces off the screen. If she moves her cursor a tenth of an inch off Cheney's face, that head bounces off the screen.
God, this much focus on a president.