Not shooting when I have this coroutine

Unity Engine
1 
using UnityEngine;
using System.Collections;

public class Shot : MonoBehaviour
{

    public Rigidbody rocketPrefab;
    public Transform barrelEnd;
    public float speed=1000;
    public GameObject crosshair;
    bool isShoting = false;
    RectTransform rt;

    void Start()
    {
        RectTransform rt = crosshair.GetComponent<RectTransform>();
    }

    void Update()
    {
        if (isShoting == false)
        {
            if (Input.GetButtonDown("Fire1"))
            {
                StartCoroutine (GetShot());
                Rigidbody RocketInstance;
                RocketInstance = Instantiate(rocketPrefab, barrelEnd.position, barrelEnd.rotation) as Rigidbody;
                RocketInstance.AddForce(barrelEnd.forward * speed);
                Destroy(RocketInstance.gameObject, 3);
            }
        }

    }

    public IEnumerator GetShot()
    {
        isShoting = true;


        // HERE IS THE PROBLEM the script shoot the bullet and stop working
        // If I disable this the shoting works nice again
        //how can I make this without affecting the shot?
        rt.sizeDelta = new Vector2(1000, 1000);


        yield return new WaitForSeconds(0.4f);
        isShoting = false;
    }
}
2

if you are attempting to do some sort of automatic fire, GetButtonDown is only true for a single frame when the button is initially pushed…

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