"What does this rule mean?"
"It means that when you turn to look at the attacker, you can only stay for a maximum of two seconds. You can't just turn around and stare at the attacker."
"And if you look at the supervisor down there, he just glances back and forth, seeing no one moving, then turns his head back again and then turns back."
"This greatly wastes those 2 seconds."
"So, for the supervisor, the correct strategy should be to turn back every three seconds!"
"Each time you turn back, stay for two seconds!"
"This way, you can maximize the time it takes for the attacker to move within the two hours, and the gap between each turn is only one second."
"This one second can not only give your neck some rest but also ensure that the attacker doesn't have a chance to move within that second."
"As long as you maintain this frequency, the supervisor is virtually unbeatable!"