how to enable and disable script.

This is a baseball game.
I have a script called IsGrounded with a boolean.It gets triggered to false which makes another script called fielding become false.This is showing both to be enabled = false,which is what i want.Now fielding i thought would be inactive without the script being checked as true,but it is still active even though it is checked to false.
I have read many other things about this in unity answers which says the scripts are still active unless i enable or disable in update,Late update or maybe Start function.how can i change my code for this i dont have update in my fielding script.here my codes

IsGrounded code

var IsGrounded = false;
function Update()
{
	IsGrounded = false;
}
function OnCollisionEnter(other:Collision)
{
	if(other.collider.name == ("Terrain"))
	
		IsGrounded = true;
	
	if(IsGrounded == true)
	{
		gameObject.Find("P_SS").GetComponent("Fielding").enabled = false;
		Debug.Log("Grounded");
	}
}

fielding code

function OnCollisionEnter(other:Collision) 
{
	if(other.collider.name == ("BaseBall(Clone)"))//&& IsGrounded == false)
	{
		Destroy(other.gameObject);
		audio.Play();
	}
}

First of all, it will be a good idea to use tags instead of names, and i think the code will go something like this:

var IsGrounded = false;
function Update()
{
    IsGrounded = false;
}
function OnCollisionEnter(other:Collision)
{
    if(other.collider.tag == ("Terrain")){
       IsGrounded = true;

       gameObject.Find("P_SS").GetComponent("Fielding").enabled = false;
       Debug.Log("Grounded");
    }
}

function OnCollisionEnter(other:Collision) 
{
    if(other.collider.tag == "BaseBall") //&& IsGrounded == false)
    {
       Destroy(other.gameObject);
       audio.Play();
    }
}

and another thing, if you want to destroy objects immediately use:

DestroyImmediate(obj: Object, allowDestroyingAssets: bool = false):