The decision is an instant; one collision of time, place, and things: a few brief milliseconds, a held breath beneath an atmosphere of water, the pull of a trigger, the snap of rubber, the acceleration of a spear.

But a decision depends on thought; an endless loop of mental action, experimentation, reasoning, calculating: dive after dive of observation, counting fish, counting heartbeats, recounting fish, selection, stalking, recounting heartbeats, measuring distances, reselecting, recounting, surfacing, diving, reselecting, focusing.

Without thought, the decision does not happen.