Prevent a turned vigilante from killing existing vampires

messages/en.json

@@ -1487,6 +1487,7 @@
     "pactbreaker_drained": "While out last night, you are suddenly overtaken by {=vampire!role:article} {=vampire!role:bold}! They drain your blood and your vision blurs, however you manage to make the vague shape of your assailant before they retreat, giving you a potential clue to their identity.",
     "pactbreaker_drained_dead": "While out last night, you are suddenly overtaken by {=vampire!role:article} {=vampire!role:bold}! They drain the rest of your blood as your consciousness fades away...",
     "pactbreaker_drained_vigilante": "While out last night, you are suddenly overtaken by {=vampire!role:article} {=vampire!role:bold}! They drain the rest of your blood as your consciousness fades away. Shortly after, you reawaken in your own home with an unnatural hunger. It seems you have become {0!role:article} {0!role:bold} yourself!",
+    "pactbreaker_vampire_no_harm": "You no longer wish to harm {0:@}, as they are now family."
     "pactbreaker_vote": [
         "The village has decided to lock {0:@} into the stocks until tomorrow."
     ],

src/gamemodes/pactbreaker.py

@@ -447,6 +447,11 @@ def on_player_protected(self,
             change_role(var, target, get_main_role(var, target), "vampire", message="pactbreaker_drained_vigilante")
             self.turned.add(target)
             self.drained.discard(target)
+            # prevent new vamp doing a cannibalism
+            for killer, victim in self.killing.items():
+                if killer == protector and get_main_role(var, victim) == "vampire":
+                    self.killing.discard(killer)
+            protector.send(messages["pactbreaker_vampire_no_harm"].format(victim))
 
     def on_night_death_message(self, evt: Event, var: GameState, victim: User, killer: User | str):
         if not isinstance(killer, User):