Minecraft wiki entry for Vindicator, associated text: A mob hitting a vindicator first time would provoke not only that vindicator, but also all vindicators nearby. Vindicators have "likeliness to call help" mechanics like Zombie reinforcements but without spawn extra mobs, the "likeliness to call help" mechanics make vindicators not always support other injured vindicators as pillagers. Attacking a vindicator does not provoke other illagers, and vice versa.