When an Enderman is enraged at someone, sometimes the Enderman will switch into its passive state. Mainly this occurs when the Enderman is at full health or when the Enderman was over 64 blocks away from the player at some point. An interesting subglitch is when the player gets over 64 blocks away and the enraged Enderman is in its passive state, the Enderman will play its calm noises instead of its angry ones.