public void FireBullet(Vector2 direction, float rotationZ)
{
ArrowScript tmp = Instantiate(arrowPrefab).GetComponent <ArrowScript>();
tmp.Initialize(player.transform);
tmp.transform.position = arrowStart.transform.position;
tmp.transform.rotation = Quaternion.Euler(0.0f, 0.0f, rotationZ - 45);
tmp.GetComponent <Rigidbody2D>().velocity = direction * arrowSpeed;
}