移动实例化对象

我正在制作一个简单的游戏作为学习c#的手段。然而，我遇到了生成多个敌人的问题。

首先，克隆的敌人不会向下移动屏幕。其次，如果敌人相互碰撞，就会产生新敌人的无限循环。我弄清楚了运动问题的一部分，我需要在Unity内的克隆上启用脚本，但我不确定如何"正确"修复它(即非手动)。

以下是敌人的脚本:

using UnityEngine;
using System.Collections;
public class Enemy : MonoBehaviour {
    public Transform TS;
    public float minSpeed = 3f, maxSpeed = 8f, currentSpeed;
    public float llocation = -9.15f, rlocation = 9.15f, ylocation = 7.65f; //Above visible screen
    // Use this for initialization
    void Start () {
        TS = transform; //Cache Transform.
        currentSpeed = Random.Range(minSpeed, maxSpeed); //Randomize enemy speed;
        TS.position = new Vector3 (Random.Range (llocation, rlocation), ylocation, 0); //Randomize enemy spawn point.
    }
    // Update is called once per frame
    void Update () {
        TS.position += (Vector3.down * currentSpeed * Time.deltaTime); //Bring enemy down the screen.
        if (TS.position.y < -5.35f) {
            TS.position = new Vector3 (Random.Range (llocation, rlocation), ylocation, 0);
            currentSpeed = Random.Range(minSpeed, maxSpeed);
        } //end new spawnpoint and speed.
    }
    void OnTriggerEnter(Collider collider)
    {
        if (collider.CompareTag("Laser") || collider.CompareTag("Player")) { //Tag is name of prefab.
            //When the laser hits the enemy, destroy the enemy.
            Destroy(this.gameObject);
        }
        if (Player.score < 500 || Player.playerLives >= 1) {
            for (int enemies = 0; enemies < 3; enemies++) {
                print("Enemies: " + enemies);
                Vector3 nposition = new Vector3 (Random.Range (llocation, rlocation), ylocation, 0);
                Instantiate(this, nposition, Quaternion.identity);
                //TS.position += (Vector3.down * currentSpeed * Time.deltaTime);
            }
        }
    }
}

void OnTriggerEnter(Collider collider)
{
    if (collider.CompareTag("Laser") || collider.CompareTag("Player")) { //Tag is name of prefab.
        //When the laser hits the enemy, destroy the enemy.
        Destroy(this.gameObject);
    }
    if(collider.CompareTag("Enemy")) {
        if (Player.score < 500 || Player.playerLives >= 1) {
            for (int enemies = 0; enemies < 3; enemies++) {
                print("Enemies: " + enemies);
                Vector3 nposition = new Vector3 (Random.Range (llocation, rlocation), ylocation, 0);
                Instantiate(gameObject, nposition, Quaternion.identity);
                //TS.position += (Vector3.down * currentSpeed * Time.deltaTime);
            }
        }
    }
}