Enemy AI help with height check

GUYS I MADE IT!! HERE IS THE SCRIPT NOW: using UnityEngine; using System.Collections; using System;

 public class EnemyRobot : MonoBehaviour {
     public GameObject gun;
     public Transform player;
     static Animator anim;
     public float attackTime;
     public float coolDown = 2f;
     public GameObject bullet;
     public Transform spawn;
 
     void Start () {
         anim = GetComponent<Animator> ();
         gun.SetActive (false);
     }
 
     // Update is called once per frame
     void Update () {
         if (Mathf.Abs (this.transform.position.y - player.transform.position.y) < 2f) { // He is above or below}
             Vector3 direction = player.position - this.transform.position;
             float angle = Vector3.Angle (direction, this.transform.forward);
             if (Vector3.Distance (player.position, this.transform.position) < 30 && angle < 180) {
 
                 direction.y = 0;
 
                 this.transform.rotation = Quaternion.Slerp (this.transform.rotation, Quaternion.LookRotation (direction), 0.1f);
                 anim.SetBool ("isIdle", false);
                 if (direction.magnitude > 10) {
                     GetComponent<Rigidbody> ().constraints = RigidbodyConstraints.FreezeRotationZ | RigidbodyConstraints.FreezeRotationX | RigidbodyConstraints.FreezeRotationY;
                     this.transform.Translate (0, 0, 0.05f);
                     anim.SetBool ("isWalking", true);
                     anim.SetBool ("isAttacking", false);
                     gun.SetActive (false);
                 } else {
                     if (attackTime > 0)
                         attackTime -= Time.deltaTime;
 
                     if (attackTime < 0)
                         attackTime = 0;
 
 
                     if (attackTime == 0) {
                         attackTime = coolDown;
                         GameObject ballInstance;
                         ballInstance = Instantiate (bullet, spawn.position, spawn.rotation) as GameObject;
                         ballInstance.GetComponent<Rigidbody> ().AddForce (transform.forward * 5000);
                         anim.SetBool ("isAttacking", true);
 
                         anim.SetBool ("isWalking", false);
                         gun.SetActive (true);
                         if (direction.magnitude < 10) {
                             GetComponent<Rigidbody> ().constraints = RigidbodyConstraints.FreezeAll;
                         }
                     }
                 }
 
 
             } else {
                 GetComponent<Rigidbody> ().constraints = RigidbodyConstraints.FreezeAll;
                 anim.SetBool ("isIdle", true);
                 anim.SetBool ("isWalking", false);
                 anim.SetBool ("isAttacking", false);
                 gun.SetActive (false);
 
             }
         }  
     }
 }

Im checking height before distance... :DDD ALL THANKS TO fafase