Brackeys Inventory System doubts...

Hello all. I am using the Brackeys Inventory System for my project. However, I attempted to modify the health potion item into a magical scroll that fires a projectile and is then removed, similar to a consumable. This did not return errors, however does not have any effect whatsoever. And just to point out, I may be missing something, since this script is in JavaScript and I am only fluent in C#, however I do not have the time to convert the whole project.

Here is my (modified) code:

 #pragma strict
 
 //This script allows you to insert code when the Item is used (clicked on in the inventory).
 
 var deleteOnUse = true;
 
 var fireparticle : GameObject;
 var lightningparticle : GameObject;
 var iceparticle : GameObject;
 var arcaneparticle : GameObject;
 
 
 private var playersInv : Inventory;
 private var item : Item;
 
 @script AddComponentMenu ("Inventory/Items/Item Effect")
 @script RequireComponent(Item)
 
 //This is where we find the components we need
 function Awake ()
 {
     playersInv = FindObjectOfType(Inventory); //finding the players inv.
     if (playersInv == null)
     {
         Debug.LogWarning("No 'Inventory' found in game. The Item " + transform.name + " has been disabled for pickup (canGet = false).");
     }
     item = GetComponent(Item);
 }
 
 //This is called when the object should be used.
 function UseEffect () 
 {
 
     if(this.gameObject.CompareTag("HP")) {
         addHealth();
     }
 
     if(this.gameObject.CompareTag("FireballScroll")) {
         Instantiate(fireparticle);
     }
 
 //    if(this.gameObject.CompareTag("LightningballScroll")) {
 //        addHealth();
 //    }
             
 //    if(this.gameObject.CompareTag("IceballScroll")) {
 //        addHealth();
 //    }
                             
 //    if(this.gameObject.CompareTag("ArcaneballScroll")) {
 //        addHealth();
 //    }
                                                     
     //Play a sound
     playersInv.gameObject.SendMessage("PlayDropItemSound", SendMessageOptions.DontRequireReceiver);
     
     //This will delete the item on use or remove 1 from the stack (if stackable).
     if (deleteOnUse == true)
     {
         DeleteUsedItem();
     }
 }
 
 //This takes care of deletion
 function DeleteUsedItem()
 {
     if (item.stack == 1) //Remove item
     {
         playersInv.RemoveItem(this.gameObject.transform);
     }
     else //Remove from stack
     {
         item.stack -= 1;
     }
     Debug.Log(item.name + " has been deleted on use");
 }
 
 function addHealth() {
     Vitals.health += 25;
 }
 
 function fireball() {
     
 }
 
 function lightningball() {
     
 }
 
 function iceball() {
     
 }
 
 function arcaneball() {
     
 }

Thanks in advance! :D