如何使我的爆炸召唤代码工作

Question

所以，我正在制作一个游戏，其中主要机制是火箭跳跃（射击你的脚上的火箭和爆炸推动你的力量（如TF2））并且我不能让爆炸只召唤一次并且它召唤在错误的地方：/

我已经尝试在if语句中添加等待，并偶然发现我目前正在使用的内容。这在理论上应该有效，但不是。

using UnityEngine;
using System.Collections;

public class Rocket : MonoBehaviour
{
    //Public changable things
    public float speed = 20.0f;
    public float life = 5.0f;
    public bool canRunProgress = true;
    public bool isGrounded;
    public GameObject Explosion;
    public Transform rocket;
    public Rigidbody rb;


    // If the object is alive for more than 5 seconds it dissapears.
    void Start()
    {
        Invoke("Kill", life);
    }
    // Update is called once per frame
    void Update()
    {
        //if the object isn't tounching the ground and is able to run it's process
        if (isGrounded == false && canRunProgress)
        {
            transform.position += transform.forward * speed * Time.deltaTime;
            canRunProgress = true;
        }
        //if the object IS touching the ground it then makes the above process unable to work and then begins the kill routine
        else if(isGrounded == true)
        {
            canRunProgress = false;
            StartCoroutine(Kill());
        }
        //detects if tounching ground
        void OnCollisionEnter(Collision other)
        {
            if (other.gameObject.tag == "Ground")
            {
                isGrounded = true;
            }
        }
        //detects if tounching ground
        void OnCollisionExit(Collision other)
        {
            if (other.gameObject.tag == "Ground")
            {
                isGrounded = false;
            }
        }
        //kill routine - explosion is summoned and explodes 2 seconds later it then destroys the rocket.
        IEnumerator Kill()
        {
            GameObject go = (GameObject)Instantiate(Explosion, transform); // also this needs to have the explosion be summoned in the middel of the rocket.
            yield return new WaitForSeconds(2f);
            Destroy(gameObject);
        }
    }
}

它应该（当火箭被发射器召唤到游戏中时）使火箭向前飞，然后当它击中地面时（标记为“地面”）停止移动并在其周围召唤爆炸并在2秒后被摧毁。目前它只是可怜地沿着地面反弹。

任何帮助，将不胜感激。：3