You've noticed that people pay attention to whatever makes the loudest noise.

After repairing a generator for at least 3 seconds, it will be highlighted to you with a yellow aura. The generator stays highlighted until it is fully repaired, you repair a new generator, or enter a locker.

Entering any locker will trigger a loud noise indicator for The Killer at the highlighted generator's location.

Red Herring can only be triggered once every 60/50/40 seconds.