典故 The episode this lot is named after
《隋唐演義》中羅成表面助敵,實則暗中助表兄秦瓊大破銅旗陣,喻表面看似承諾,實為虛幻不實。
A story from the Sui-Tang romances where rebels had to break the invincible Bronze Flag Array. Luo Cheng pretended to help the enemy while secretly promising to help his cousin break the array. The lot uses this 'empty promise' metaphor to warn that things are not as they seem, and relying on hollow agreements is like grasping at the moon's reflection.

