Lerpz won't punch

Unity Engine
1

I am following the 3rd person platformer tutorial and I have come across a problem. I am at the part where you add to script ThirdPersonCharacterAttack to Lerpz to enable him to punch the enemies. Upon adding this all Lerpz does is punch once automatically when he spawns, and I am unable to punch after that. Anyone else have this issue? This is just one of many problems that I have had with this tutorial.

Here is the script that I am using:
ThirdPersonCharacterAttack

var punchSpeed = 1;
var punchHitTime = 0.2;
var punchTime = 0.4;
var punchPosition = new Vector3 (0, 0, 0.8);
var punchRadius = 1.3;
var punchHitPoints = 1;

var punchSound : AudioClip;

private var busy = false; 

function Start ()
{
	animation["punch"].speed = punchSpeed;	
}

function Update ()
{
	var controller : ThirdPersonController = GetComponent(ThirdPersonController); 
	if(!busy  Input.GetButtonDown ("Fire1")  controller.IsGroundedWithTimeout()  !controller.IsMoving())
	{	
		SendMessage ("DidPunch");
		busy = true;
	}
}

function DidPunch ()
{
	animation.CrossFadeQueued("punch", 0.1, QueueMode.PlayNow);
	yield WaitForSeconds(punchHitTime);
	var pos = transform.TransformPoint(punchPosition);
	var enemies : GameObject[] = GameObject.FindGameObjectsWithTag("Enemy");
	
	for (var go : GameObject in enemies)
	{
		var enemy = go.GetComponent(EnemyDamage);
		if (enemy == null)
			continue;
			
		if (Vector3.Distance(enemy.transform.position, pos) < punchRadius)
		{
			enemy.SendMessage("ApplyDamage", punchHitPoints);
			// Play sound.
			if (punchSound)
				audio.PlayOneShot(punchSound);
		}
	}
	yield WaitForSeconds(punchTime - punchHitTime);
	busy = false;
}

function OnDrawGizmosSelected ()
{
	Gizmos.color = Color.yellow;
	Gizmos.DrawWireSphere (transform.TransformPoint(punchPosition), punchRadius);
}

@script RequireComponent(AudioSource)
2

Anyone? I really need help with this.

3

Looking over the code my first thought would be to check your yeild logic and make sure that it is working flawlessly - print to the debug log to check that you are trransitioning your states properly.

Yields as controls have caused me some huge headaches in the past. Since your yeilded functions directly control the busy/nonbusy state of things that could easilly be your culprit.