It's always the small, simple changes that cause the most problems. Invulnerability system hopefully working for real this time.

src/enemy.py

@@ -49,10 +49,12 @@ class Enemy(Object):
         # Initialize vulnerability system
         self.hasVulnerabilitySystem = kwargs.get('has_vulnerability', False)
         if self.hasVulnerabilitySystem:
-            self.isVulnerable = kwargs.get('is_vulnerable', False)  # For enemies with vulnerability, default to invulnerable
+            self.isVulnerable = False  # Start invulnerable
             self.vulnerabilityTimer = pygame.time.get_ticks()
-            self.vulnerabilityDuration = kwargs.get('vulnerability_duration', 1000)
+            self.vulnerabilityDuration = kwargs.get('vulnerability_duration', 2000)
             self.invulnerabilityDuration = kwargs.get('invulnerability_duration', 5000)
+            soundName = f"{self.enemyType}_is_vulnerable" if self.isVulnerable else self.enemyType
+            self.channel = obj_play(self.sounds, soundName, self.level.player.xPos, self.xPos)
         else:
             self.isVulnerable = True
 
@@ -67,6 +69,7 @@ class Enemy(Object):
             self.movementSpeed *= speedMultiplier  # Spiders are faster
             self.attackPattern = {'type': 'hunter'}  # Spiders actively hunt the player
             self.turnThreshold = 3  # Spiders turn around quickly to chase player
+
             
     @property
     def xPos(self):
@@ -94,30 +97,25 @@ class Enemy(Object):
         """Update enemy position and handle attacks"""
         if not self.isActive or self.health <= 0:
             return
-    
-        # Set initial sound for enemies with vulnerability system
-        if self.hasVulnerabilitySystem and self.channel is None:
-            soundName = f"{self.enemyType}_is_vulnerable" if self.isVulnerable else self.enemyType
-            self.channel = obj_play(self.sounds, soundName, player.xPos, self.xPos)
-
-        # Enemy vulnerability state management
+            
+        # Initialize sound for enemies with vulnerability system immediately upon creation
         if self.hasVulnerabilitySystem:
-            if self.isVulnerable and (currentTime - self.vulnerabilityTimer > self.vulnerabilityDuration):
-                # Switch to invulnerable
-                self.isVulnerable = False
+            if self.channel is None:
+                soundName = f"{self.enemyType}_is_vulnerable" if self.isVulnerable else self.enemyType
+                self.channel = obj_play(self.sounds, soundName, player.xPos, self.xPos)
+            # Update existing channel position
+            else:
+                self.channel = obj_update(self.channel, player.xPos, self.xPos)
+                
+            # Check for vulnerability state change
+            if currentTime - self.vulnerabilityTimer >= (self.vulnerabilityDuration if self.isVulnerable else self.invulnerabilityDuration):
+                self.isVulnerable = not self.isVulnerable
                 self.vulnerabilityTimer = currentTime
-                # Change sound back to base enemy sound
+                
                 if self.channel:
                     obj_stop(self.channel)
-                self.channel = obj_play(self.sounds, self.enemyType, player.xPos, self.xPos)
-            elif not self.isVulnerable and (currentTime - self.vulnerabilityTimer > self.invulnerabilityDuration):
-                # Switch to vulnerable
-                self.isVulnerable = True
-                self.vulnerabilityTimer = currentTime
-                # Change to vulnerable sound
-                if self.channel:
-                    obj_stop(self.channel)
-                self.channel = obj_play(self.sounds, f"{self.enemyType}_is_vulnerable", player.xPos, self.xPos)
+                soundName = f"{self.enemyType}_is_vulnerable" if self.isVulnerable else self.enemyType
+                self.channel = obj_play(self.sounds, soundName, player.xPos, self.xPos)
 
         # Check if player has entered territory
         if not self.hunting:
@@ -226,8 +224,7 @@ class Enemy(Object):
         
     def take_damage(self, amount):
         """Handle enemy taking damage"""
-        # Enemy can only take damage when vulnerable
-        if not self.isVulnerable:
+        if self.hasVulnerabilitySystem and not self.isVulnerable:
             return
 
         self.health -= amount