применение Делегата....

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

public class GameController : MonoBehaviour {

    delegate void DoSpawn();
    DoSpawn doMySpawn;

    public GameObject hazard;
    public Vector3 spawnValues = new Vector3(6, 0, 16);
    public float spawnWait = .5f;
    public float wait = 1;

    float nextTime;

    // Use this for initialization
    void Start ()
    {
        nextTime = Time.time + wait;
        doMySpawn = Do1;
    }

    void SpawnWaves()
    {
        Vector3 spawnPosition = new Vector3(
            Random.Range(-spawnValues.x, spawnValues.x),
            spawnValues.y, spawnValues.z);

        Quaternion spawnRotation = Quaternion.identity;
        Instantiate(hazard, spawnPosition, spawnRotation);
    }

    void Do1()
    {
        if (Time.time > nextTime)
        {
            Do2();
            doMySpawn = Do2;
        }
    }

    void Do2()
    {
        if (Time.time > nextTime)
        {
            nextTime = Time.time + spawnWait;
            SpawnWaves();
        }
    }

    // Update is called once per frame
    void Update () {
        doMySpawn();
    }
}