'Enemies' Dissapearing whenever I get closec

Hi, Firstly, I want to note that it is a 3D game.

Secondly, I was following a tutorial when I did it, and he was using the same version.

Heres my script:

var Distance; var Target : Transform; var LookAtDistance = 30.0; var chaseRange = 20.0; var AttackRange = 2.0; var moveSpeed = 4.0; var Damping = 6.0; var attackRepeatTime = 1.0; var theDamage = 40.0; private var AttackTime : float; var controller : CharacterController; var gravity : float = 20.0; private var moveDirection : Vector3 = Vector3.zero;

function Start () { attackTime = Time.time; }

function Update () { Distance = Vector3.Distance(Target.position, transform.position);

 if (Distance < LookAtDistance)
 {
     LookAtPlayer();
 }

 if (Distance < AttackRange)
 {
     AttackPlayer();
 }

 else if (Distance < chaseRange)
 {
     ChasePlayer();
 }

}

function LookAtPlayer() { var rotation = Quaternion.LookRotation(Target.position - transform.position);

 transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * Damping);

}

function ChasePlayer() { moveDirection == transform.forward;

 moveDirection *= moveSpeed;

 moveDirection.y -= gravity * Time.deltaTime;

 controller.Move(moveDirection * Time.deltaTime);

}

function AttackPlayer() { if (Time.time > AttackTime)

 {
     Target.SendMessage("ApplyDamage", theDamage);

     attackTime = Time.time + attackRepeatTime;
 }

}

function ApplyDamage() { chaseRange += 30; moveSpeed += 2; LookAtDistance += 40; }

Ok, Now here is a screenshot: