The free safety tends to watch the play unfold and follow the ball as well as be the "defensive quarterback" of the backfield. The free safety is typically assigned to the quarterback in man coverage, but as the quarterback usually remains in the pocket, the free safety is "free" to double cover another player. On pass plays, the free safety is expected to assist the cornerback on his side and to close the distance to the receiver by the time the ball reaches him. If the offense puts a receiver in the slot, then the free safety may be called upon to cover that receiver. Because of their speed and deep coverage, free safeties are especially likely to make interceptions.