Why Zombie clones dont take Player's HP?

Hi. I make Zombie.prefab with this code:

 using UnityEngine;
 using System.Collections;
 
 public class FollowBotAI : MonoBehaviour {
 
     Transform Leader;
     float AISpeed = 1;
     float MaxDistance = 10;
     float MinDistance = 1.5f;
     public bool attack = false;
     public bool dead = false;
 
     public int MaxHP = 5;
     public int CurHP;
 
     private Animator anim;
 
     void Start () {
         Leader = GameObject.FindGameObjectWithTag ("Player").transform;
         anim = gameObject.GetComponent<Animator> ();
 
         CurHP = MaxHP;
     }
     
     void Update () 
     {
         anim.SetFloat ("speed", AISpeed);
         anim.SetBool ("attack", attack);
         anim.SetBool ("dead", dead);
 
         transform.LookAt (Leader);
         AI ();
 
         if (CurHP == 0) 
         {
             dead = true;
         }
     }
 
     void AI()
     {
         if (Vector3.Distance (transform.position, Leader.position) >= MinDistance) {
             transform.position += transform.forward * AISpeed * Time.deltaTime;
             attack = false;
             
         } else 
         {
             attack = true;
         }
     }
 
     void AIDie()
     {
         Destroy (gameObject);
     }
 }
 

Main priority is true or false "attack". I have Player with this HP behavior code:

 using UnityEngine;
 using System.Collections;
 
 public class HPbehavior : MonoBehaviour {
 
     public GameObject zombie;
 
     public int maxHP = 100;
     public int curHP;
 
     private FollowBotAI botAI;
 
     void Start()
     {
         curHP = maxHP;
         botAI = zombie.GetComponent<FollowBotAI> ();
     }
 
     void Update()
     {
         if (botAI.attack == true) 
         {
             curHP = curHP - 1;
         }
 
         if (curHP <= 0) 
         {
             Destroy(this.gameObject);
         }
     }
 
     void OnGUI()
     {
         string textHP = "Health: " + (curHP);
         GUI.Box (new Rect (Screen.width - 150, 20, 130, 20), textHP);
     }
 
 }
 

Well...if attack is true, HP is losing. I put my Zombi.prefab in to HPbehavior:

In my Zombi.prefab is Code FollowBotAI:

I dont know why Zombi(clones) dont take Player's HP. What is wrong with my Codes? I check if attack is real true, when zombie attacking Player. Yes, it is. But it ignore my condition in HPbehavior code. PLease help me...