The camera follows the taker while the referee manages a situation with several moving parts. What happens in those seconds determines whether the kick proceeds cleanly.
Clearing the area is the first task
Every player except the taker and the goalkeeper must be outside the penalty area, outside the arc and behind the ball before the kick can be taken.
Enforcing that against players who drift forward deliberately requires the referee to hold the restart until the positions are correct.
Officials generally give one verbal instruction and then wait, since blowing early rewards the encroachment the delay is intended to prevent.
The taker must be identified and the ball must be still
The referee confirms which player is taking the kick, because a different player striking it is an offense and the identification prevents confusion.
The ball has to be stationary on the mark, and a taker repositioning it after the whistle can be required to reset.
These checks are quick but they are the reason a referee stands where he does, with a sight line to both the ball and the goal line.
Goalkeeper position is now explicitly policed
The goalkeeper must have part of at least one foot on or in line with the goal line at the moment the kick is struck.
Assistant referees and video officials monitor this, and a keeper who is entirely off the line when saving can see the kick ordered again.
Knowing that, keepers time a forward movement to arrive just as the ball is struck rather than before it, which is legal and effective.
Temperature control is an unwritten part of the role
The award of a penalty is often followed by protests, and the referee has to accept a period of complaint without letting it become a confrontation.
Experienced officials move away from the group rather than into it, which lowers the intensity and gives players somewhere for the emotion to go.
Cautions issued here are usually for dissent that continues after a clear warning, rather than for the initial reaction to the decision.
The whistle is a signal, not a starting gun
The taker may not begin the run-up before the whistle, but there is no requirement to strike immediately afterward and a pause is permitted.
What is not permitted is a feint after completing the run-up, which is judged as unsporting and results in an indirect free kick if it produces a goal.
Referees therefore watch the final stride closely, and that single judgment is among the harder real-time decisions in the laws of the game.