Core/Units: send AI reactions uppon entering combat instead of attacking an enemy

src/server/game/Entities/Creature/Creature.cpp

@@ -3272,6 +3272,14 @@ bool Creature::IsEngaged() const
     return false;
 }
 
+void Creature::AtEnterCombat()
+{
+    Unit::AtEnterCombat();
+
+    if (GetAI() && !IsControlledByPlayer())
+        SendAIReaction(AI_REACTION_HOSTILE);
+}
+
 void Creature::AtEngage(Unit* target)
 {
     Unit::AtEngage(target);

src/server/game/Entities/Creature/Creature.h

@@ -364,6 +364,7 @@ class TC_GAME_API Creature : public Unit, public GridObject<Creature>, public Ma
         void MakeInterruptable(bool apply);
 
         bool IsEngaged() const override;
+        void AtEnterCombat() override;
         void AtEngage(Unit* target) override;
         void AtDisengage() override;
 

src/server/game/Entities/Unit/Unit.cpp

@@ -5586,8 +5586,6 @@ bool Unit::Attack(Unit* victim, bool meleeAttack)
     if (creature && !IsControlledByPlayer())
     {
         EngageWithTarget(victim); // ensure that anything we're attacking has threat
-
-        creature->SendAIReaction(AI_REACTION_HOSTILE);
         creature->CallAssistance();
 
         // Remove emote state - will be restored on creature reset