When we show make a bold choice the moment we step out on stage, a blank slate is immediately endowed with an active element that provides fuel for a scene to grow. If we put off making a choice - instead timidly walking out to the center of the stage to meet our scene partner and cautiously negotiate a scene on vague information - the scene is doomed not to go anywhere out of fear of going in the "wrong" direction. In improv we are collaboratively building something out of nothing; the moment we make a choice we have something to build from, and the earlier in the scene we have that something the better.