To acknowledge voice commands, Halcyon would reiterate what it believed it "heard" the player say. This sometimes resulted in incorrect actions taken, especially if the player had a significantly different inflection or spoke something different from the choices expected. Probability ranking could trigger Halcyon to ask the player to repeat their choice when it received a poor match to all expected responses. Mis-recognitions were chiefly the result of a sample of speech given sufficient probability to match one of the anticipated words or phrases.