Zachary had consistently believed that he could end the battle before the enemy opened the connecting passage, that is, he could clear all the enemies inside the Mysterious Ship within five minutes, and he did just that.
Therefore, Zachary gradually forgot about this rule. Initially, when Zachary altered the appearance of the White Bone Puppets, it was actually to have them stationed at the entrance of the passage for defense. However, as the quality of the Bloodthirsty Banner and the Hundred Ghosts Banner continued to improve, the White Bone Banner, aside from clearing the battlefield of remaining white bones, lost any other purpose.
If it weren't for Zachary's habit of summoning the Three Flags every time he entered the Mysterious Ship, he might have even forgotten about this matter.
