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

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

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