Code works only for one of multiple existing instances

I want to turn the canvas to look at player camera but it only works for the first in hierarchy instance here is one of codes i tried to fix it

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class EnemyHpBarLookAt : MonoBehaviour
6. {
7.     void Update()
8.     {
9.         foreach(Transform enem in transform)
10.             foreach(Transform child in enem)
11.             {
12.                 if(child != null)
13.                 {
14.                     EnemyHpBar cameraPosFun = (EnemyHpBar) child.transform.GetComponent(typeof(EnemyHpBar)) as EnemyHpBar;
15.                     var pos = cameraPosFun.getPos();
16.                     child.transform.LookAt(pos);
17.                     Debug.Log(child.GetInstanceID());
18.                 }
19.             }
20.     }
21. }
22.  

 

It seems to cycle betwen instances IDs

 

Can you explain what each of these lines is intended to do?

 

Also this line is just... what:

Code (CSharp):

1. EnemyHpBar cameraPosFun = (EnemyHpBar) child.transform.GetComponent(typeof(EnemyHpBar)) as EnemyHpBar;

It could easily be converted down into:

Code (CSharp):

1. EnemyHpBar enemyHpBar = child.GetComponent<EnemyHPBar>();