Stab at easing the delayed invoke of whatever (untested).

InvokeDelayed.cs

void InvokeDelayed (Action action, float seconds)
{
    StartCoroutine (DoInvokeDelayed (action, seconds));
}


IEnumerator DoInvokeDelayed (Action action, float seconds)
{
    yield return new WaitForSeconds (seconds);
    action ();
}


// Use

InvokeDelayed (() => { ShootAtAllOfTheThing (withThis, andThat, alsoThisOne); }, 1.0f);