Health Will Not Deplete as I shoot Enemy.

I do not know what is wrong. No console errors. Just everytime I shoot my enemy with raycast the health will not go down. Here is my code: using UnityEngine; using System.Collections;

public class health : MonoBehaviour {

     public int DamageAmount=5;
     public float TargetDistance;
     public float AllowedRange=15;
     public RaycastHit Shot;
 public int maxhealth=50;
 public int currenthealth;
 //cant die
 public bool invincible;
 public bool dead;
 //check if ou want to enable health regeneration
 public bool regenerate;
 //time between each generate
 public float regenerationtime=0.8f;
 //the timer
 private float regtimer;
 //amount of hp to regenerate per generate
 public int regenerationamount=2;
 private int healthsave;
 public bool givereward;
 private bool rewardgiven;
 public int xptogive=10;
 public int goldtogive=10;
 
 
 // Use this for initialization
 void Start () {
         givereward=false;
     
     AI ai=(AI)GetComponent("AI");
     if(ai) ai.health=maxhealth;
     
 currenthealth=maxhealth;
     healthsave=maxhealth;
 }
 
 // Update is called once per frame
 void Update () {
 
             if (Physics.Raycast (transform.position, transform.TransformDirection (Vector3.forward), out Shot)) {
                     TargetDistance = Shot.distance;
                     if (TargetDistance < AllowedRange) {
                             Shot.transform.SendMessage ("LoseHealth", 10);
                     }
             }
     
     
     //tell ai when health is changed
     if(healthsave>currenthealth|healthsave<currenthealth){
         AI ai=(AI)GetComponent("AI");
         if(ai){
         ai.health=currenthealth;
         healthsave=currenthealth;
         }
     }
     
     //death 
     if(dead){
         AI ai=(AI)GetComponent("AI");
         //tell ai that he is dead
         if(ai)ai.dead=true;
     }
     else givereward=true;
     
     if(currenthealth>=maxhealth) currenthealth=maxhealth;
     
     //if health is less than zero
     if(currenthealth<=0){
         //check if invincible if not death
         if(invincible)dead=false;
         else dead=true;
         currenthealth=0;
     }
     //regenerate
     if(regenerate){
         if(currenthealth<maxhealth&currenthealth>0){
     regtimer+=Time.deltaTime;
     if(regtimer>regenerationtime){
                 currenthealth=currenthealth+regenerationamount;
                 regtimer=0;
             }
     
     }
     }
 }

}