public void OnTriggerEnter2D(Collider2D collider)
    {
        GameUnitEntity unit = collider.GetComponent <GameUnitEntity>();

        if (unit != null)
        {
            if (this.owner != unit.owner)
            {
                unit.owner.removeCaptureEntity(this);
                unit.owner.setCapturedEntity(this);
            }

            unit.dir = this.dirValue;
        }
    }