★Kazusi Nishi

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public class EnemyStopItem : MonoBehaviour
{
    public AudioClip getSound;
    public GameObject effectPrefab;
    private GameObject EnemyB;
    private GameObject[] enemies;

    // 削除
    //public bool enabled= true;
    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player"))
        {
            // 改良・重要
            //Destroy(gameObject);
            this.gameObject.SetActive(false);

            AudioSource.PlayClipAtPoint(getSound, transform.position);
            GameObject effect = Instantiate(effectPrefab, transform.position, Quaternion.identity);
            Destroy(effect, 0.5f);
            enemies = GameObject.FindGameObjectsWithTag("EnemyB");
            foreach (GameObject e in enemies)
            {
                //e.GetComponent<NavMeshAgent>().enabled = false;

                // （改良）スピードを０にする
                e.GetComponent<NavMeshAgent>().speed = 0;
            }

            // （追加）
            // 3秒後にスピードを戻す。
            Invoke("ResetSpeed", 3);
        }
    }

    // （追加）
    void ResetSpeed()
    {
        enemies = GameObject.FindGameObjectsWithTag("EnemyB");
        foreach (GameObject e in enemies)
        {
            // （改良）スピードを1に戻す
            e.GetComponent<NavMeshAgent>().speed = 1;
        }
    }
}