/// <summary>
        /// Instantiates an enemy and puts him in the level.
        /// </summary>
        private Tile LoadEnemyTile(int x, int y, string spriteSet)
        {
            Vector2 position = GetBounds(x, y).GetBottomCenter();
            var enemy = new Enemy(this, position, spriteSet);
            enemies.Add(enemy);
            Game.Penumbra.Lights.Add(enemy.Light);

            return new Tile(null, TileCollision.Passable);
        }
 /// <summary>
 /// Called when the player is killed.
 /// </summary>
 /// <param name="killedBy">
 /// The enemy who killed the player. This is null if the player was not killed by an
 /// enemy, such as when a player falls into a hole.
 /// </param>
 private void OnPlayerKilled(Enemy killedBy)
 {
     Player.OnKilled(killedBy);
 }
        /// <summary>
        /// Called when the player has been killed.
        /// </summary>
        /// <param name="killedBy">
        /// The enemy who killed the player. This parameter is null if the player was
        /// not killed by an enemy (fell into a hole).
        /// </param>
        public void OnKilled(Enemy killedBy)
        {
            IsAlive = false;

            if (killedBy != null)
                killedSound.Play();
            else
                fallSound.Play();

            sprite.PlayAnimation(dieAnimation);
        }