Function call only works on one specific game object

I've been building a game that has a region attached to an enemy prefab instance that, when a player enters the region, the object fires at them. The issue is, however, whenever there are two or more instances of the enemy, when the player enters the second enemy's region, the first one fires. So, I am wondering what the problem may be.

Here is my scripts responsible for the above interaction:

 using UnityEngine;
 using System.Collections;
 
 public class RegionFire : MonoBehaviour {
 
     public Fire FireScript;
     public GameObject ScriptHolder;
 
     void Awake() {
         
         ScriptHolder = GameObject.FindGameObjectWithTag ("ScriptHolder");
         FireScript = ScriptHolder.GetComponent<Fire> ();
     }
 
     void OnTriggerEnter2D(Collider2D other){
         if (other.gameObject.CompareTag ("enemyRegion")) {
             FireScript.InRegion = true;
             Debug.Log("RegionFireCollide");
         }
     }
 
 }
 
 using UnityEngine;
 using System.Collections;
 
 public class Fire : MonoBehaviour {
 
     public bool InRegion;
     public GameObject bullet;
     private GameObject enemy;
     public Transform cannon;
     public float speed;
     public float interval;
 
     // Use this for initialization
     void Start ()
     
     {
         interval = 0;
         InRegion = false;
     }
     
     // Update is called once per frame
     void Update () {
         if (InRegion == true && interval <= 0) {
             SpawningClones ();
         }
         if (interval <= 1 && interval >= 0) {
             interval -= Time.deltaTime;
         }
     }
     void SpawningClones (){
         GameObject bulletInstance = Instantiate (bullet, cannon.position, cannon.rotation) as GameObject;
         bulletInstance.GetComponent<Rigidbody2D>().AddForce (cannon.forward * speed, ForceMode2D.Impulse);
         interval = 1;
     }
 }
 

Please note that I will not be able to get back to this until tomorrow, so keep that in mind when replying.