It is never easy to coordinate attacks. Just like on a battlefield, where stray arrows pose a danger, the unpredictable strike of an ally's blade can also be treacherous. That's why, in martial arts, group attacks against a single opponent—what is called a "coordinated assault"—are often carefully trained in teams. It's not simple.

Thus, the attack by the three avengers, strictly speaking, is less of a coordinated effort and more of a sequential assault. Dan Hwachul strikes first, locking blades with Cheong, followed by the swordsman, and finally, the spearman, who waits for a narrow opening to strike through the …