Cant exit IsKinematic

Hey guys! I set up a script so that when i pick up a gun, sword, whatever, when I click the RMB, the obejct is dropped, moves the direction the muse is pointing at and then, after a certain distance, it stops, however, when the script is executed, the gun just drifts away, apparently, the script doesnt excecute all the way

Here is the script:

 using UnityEngine;
 using System.Collections;
 
 public class ThrowWeapon : MonoBehaviour {
     EnemyAttacked attacked;
     float timer = 2.0f;
     Vector3 direction;
     Rigidbody2D rid;
     GameObject player;
     // Use this for initialization
     void Start () {
         player = GameObject.FindGameObjectWithTag ("Player");
         rid = this.GetComponent<Rigidbody2D> ();
         rid.AddForce (direction*40);
     }
     
     // Update is called once per frame
     void Update () {
         transform.rotation = Quaternion.Slerp(this.transform.rotation,new Quaternion(this.transform.rotation.x,this.transform.rotation.y,this.transform.rotation.z-1,this.transform.rotation.w), Time.deltaTime * 10);
         timer -= Time.deltaTime;
         if(timer<=0)
         {
             rid.isKinematic = true;
             Debug.Log("ItWorks");
             Destroy (this);
         }
     }
 }

Thanks in advance!