Destroy(GameObject) problem

Questions & Answers
1

void Update () {

		RaycastHit hit;
		
		Vector3 forward = transform.TransformDirection (transform.up) * 1;
		Debug.DrawRay (transform.position,transform.up,Color.green);
		
		if(Physics.Raycast (transform.position,(transform.up), out hit)) {
			Debug.DrawRay (transform.position,transform.up,Color.red);

			if(hit.transform.gameObject.tag == "Enemy"&& Input.GetMouseButtonDown(0)) {
				shoot = true;
				print ("SHOOOt");
				AIisDead = true; 
				Destroy (hit.GameObject);
			}

´(This is a script attached to a gun)
When the raycast hits a object with the tag enemy, that object needs to be destroyed. But i cant really find out how to do it. the “hit” is that object the raycast is “touching”. And that is the object i want to destroy if i press the mouse button and the object is tagged enemy.

I tried doing in the way that from my enemys script, i destroy if the AIisDead from this script, is true.
But that destroyed all the enemys in the scene.

2

is the AlisDead is static variable? Because I having this problem before, but I found out is because I put the variable as a static variable, so the value on other enemy get affected