     // MARK: Sibling information
     var gameScene: GameScene?
     var siblings: [SKEnemyNode?]?
-    var arrayPosition: Int?
     
     // MARK: Make enemy deteriorate.
     func deteriorate() {

            enemy.textureArray = textureMatrix[enemyNumber]
            enemy.gameScene = self
            enemy.siblings = enemyArray
            enemy.arrayPosition = enemyArray.endIndex - 1
        
            // Add enemy to scene
            switch arc4random_uniform(4) {

                    self.texture = textureArray?[3]
                case .finishHim:
                    self.isHidden = true
                    _ = siblings?.remove(at: (siblings?.index(where: { $0 == self }))!)
                    gameScene?.spawnEnemies()
                    self.removeFromParent()
            }
