C# How to change a variable in another script when looking at the object but not a duplicate of it?

 public class DetectionObject : MonoBehaviour {
 
     public float Reach = 5f;
     public GameObject Tree;
     private TreeController TC;
 
     // Use this for initialization
     void Start() {
         TC = Tree.GetComponent<TreeController> ();
     }
     
     // Update is called once per frame
     void Update () {
 
         RaycastHit hit;
         Vector3 fwd = transform.TransformDirection (Vector3.forward);
         Debug.DrawRay (transform.position, fwd * Reach, Color.red);
         if (Physics.Raycast (transform.position, fwd, out hit, Reach) && hit.transform.CompareTag ("Item") && Input.GetMouseButtonDown (0))
             TC.treeHealth -= 100f;
 
             }
     }

This is the Code for the Detection component which uses raycast to see what it's looking at. The problem is that I want to cut down a tree. I can cut down one but when i try to cut down the other it cuts down the original? how can I fix this

Heres the code of the tree:

 using UnityEngine;
 using System.Collections;
 
 public class TreeController : MonoBehaviour {
 
     public GameObject Log;
     public float treeMaxHealth = 100f;
     public float treeHealth;
 
     // Use this for initialization
     void Start () {
         treeHealth = treeMaxHealth;
     }
     
     // Update is called once per frame
     void Update () {
         if (treeHealth < 1) {
             OnTreeDestroy ();
         }
     }
 
 
 
     void OnTreeDestroy(){
         Instantiate (Log, transform.position, Random.rotation);
         Instantiate (Log, transform.position, Random.rotation);
         Instantiate (Log, transform.position, Random.rotation);
         gameObject.SetActive (false);
     }
 }