Question about bullets and networking

So two people spawn, they both have the same script to shoot guns. What could I do to make it recognize which person it came from and so it only hurts the enemy (other person in the level)

    void Update () {
              if (photonView.isMine){
                 if (Input.GetKeyDown(KeyCode.W) && Time.time > nextFire){
                     nextFire = Time.time + fireRate;
                     GameObject bullet = PhotonNetwork.Instantiate("bullet", transform.position, transform.rotation, 0);
                     bullet.rigidbody.AddForce(transform.up * bulletSpeed);