Enemyhealth component problem

Hey guys I'm writing a script that creates an array of all enemies then draws a ray from the player character, when the ray hits one it becomes the targeted enemy. But once I kill that enemy all the others get killed as well. Here's my scripts:

 using UnityEngine;
 using System.Collections;
 
 public class Attack : MonoBehaviour {
     
     public RaycastHit hit;
     public Vector3 directionRay;
     public int range = 20000;
     public GameObject player;
     public GameObject projectile;
     public GameObject[] targets;
     public static GameObject target;
     public float speed = 200.0f;
     bool isFired = SelfDest.isFired;
     bool isReloading;
     public Texture2D crosshair;
     public int zoom = 200;
     public int normal = 60;
     public float smooth = 40;
     public int bulletnumb = 12;
     public int magazine = 3;
     public AudioClip shoot;
     public AudioClip reload;
     public bool hashit = SelfDest.hashit;
 
 
     // Use this for initialization
     void Start () {
         player = GameObject.FindGameObjectWithTag("Player");
         isReloading = false;
         targets = GameObject.FindGameObjectsWithTag("Enemy");
     }
     
     // Update is called once per frame
     void Update () {
         directionRay = transform.TransformDirection(Vector3.forward);
         Debug.DrawRay(transform.position, directionRay * range, Color.red);
         if(Physics.Raycast(transform.position, directionRay, out hit, range)){
             if(hit.collider.gameObject.tag == "Enemy" && hashit == true){
             target = hit.collider.gameObject;
             }
         }
         if(Input.GetButton("Fire1") && bulletnumb >= 1){
             if(!isFired){
                 isFired = true;
                 GameObject bullet = Instantiate(projectile, transform.parent.position, transform.parent.rotation) as GameObject;
                 bullet.rigidbody.velocity = transform.forward * speed;
                 audio.PlayOneShot(shoot);
                 bulletnumb--;
                 Physics.IgnoreCollision(bullet.collider, player.collider);
                 EnemyHealth eh = (EnemyHealth)target.GetComponent("EnemyHealth");
                 eh.AdjustHealth(-30);
                 Invoke("Shoot", 0.45f);
             }
         }
             if(bulletnumb == 0){
                 Invoke("Reload1", 0.75f);
             }
         if(Input.GetButton("Fire2") && isReloading == false){
             isReloading = true;
             Invoke("Reload2", 0.75f);
         }
     }
 
     void Shoot(){
         isFired = false;
     }
     
     void Reload1(){
         if(bulletnumb <= 0 && magazine >= 1){
             bulletnumb = 12;
             audio.PlayOneShot(reload);
             magazine--;
         }
     }
     
     void Reload2(){
         if(magazine >= 1){
             bulletnumb = 12;
             audio.PlayOneShot(reload);
             magazine--;
             isReloading = false;
         }
     }
     
     
     void OnGUI(){
         GUI.Box(new Rect(Screen.width/2, Screen.height/2, 10, 10), crosshair);
         GUI.Box(new Rect(10, 35, 40, 20), bulletnumb + "/" + magazine);
     }
 
 }

Any help will be immensely appreciated. Thanks in advance