What does the 3 often mentioned in King of Glory mean?

At the end of military training, the instructor usually assembles the team and then asks the students to say loudly three times, "disperse!"

Scatter means disbanding, and 3 is the homophone of disperse. Because it is troublesome to disperse, we use 3, which is simple and easy to fight, instead. Usually, the meaning of 3 in King is that your teammates remind you to retreat quickly. Disperse quickly, go away quickly, can't fight, it means to run quickly.