As I stated in one of our previous articles, quarterback tactics is essential in a QB's play. He must have the offensive and defensive knowledge to know what exactly the offensive play is and how the defense is stacked up to potential defend the play. If QB’s aren’t comfortable with the formation the defense is using and see it as a potential disruption of the play before it even starts, they can call an audible to change their play.
Consider the following example:
If the quarterback receives the call to execute a running play, but he notices that the defense is ready to blitz, sending additional defensive backs across the line of scrimmage in an attempt to tackle the quarterback or impede his ability to pass—the quarterback may opt to change the play. To do this, the quarterback yells a special cadence, like "Blue 42," or "Black 29," which tells the offense to switch to a specific play or formation.
Other Quarterback Tactics
The sport of football is partly about proper clock management. One tactic QB’s use in order to control the game clock is the ball spike. Here, the QB spikes or throws the football to the ground to stop the official game clock due to the “dead” ball. So, for example, if a team is down by a field goal with only seconds remaining, a quarterback may spike the ball to prevent the game clock from running out. This tactic usually offers the field goal unit to come onto the field to attempt a winning kick, or gives the offense one more go at scoring a touchdown via the "Hail Mary pass". On the contrary, if a team is winning, a quarterback can keep the clock running by kneeling after the snap. This is normally done when the opposing team has no timeouts and there is little time left in the game, as it allows a team to burn up the remaining time on the clock without risking a turnover or injury.