Edit: A new script has been made to replace the old one. Only the new script is shown. The enemy no longer flies upward, but is currently not dropping downward.

I am making a game for a project where the main character has to defeat enemies to continue. The problem is that the enemies drop downward, but then suddenly fly upward! I have tried to keep the character down, but attempts have been unsuccessful. Before this point, the character would just float in space... Here is the code I currently have on the enemy:

The Character Controller

A Capsule Collider (for other events)

This script (in Javascript):

#pragma strict

// Set variables related to movement and individual states.

var idleTime : float = 3.1;
var marManMoveSpeed : float;
var marManRotateSpeed : float;
var gravity : float;
var attackTarget : Transform;
var chaseDistance : float;
var attackDistance : float;
private var moveDirection : Vector3 = Vector3.zero;
private var wait : boolean = false;

// Set variables for the states.
private var idle : int = 0;
private var walk : int = 1;
private var attack : int = 2;
private var status : int = idle;
var controller : CharacterController;
controller = GetComponent(CharacterController);

function Update(){
	var controller : CharacterController = GetComponent(CharacterController);
	
	var aggro : float = Vector3.Distance(attackTarget.position,transform.position);

	print(aggro);

	//Define what causes the states.
	if (aggro < chaseDistance && aggro > attackDistance){
		status = walk;
	}
	else if(aggro < attackDistance){
		status = attack;
	}
	else if(aggro > chaseDistance){
		status = idle;
	}	

	//Always apply gravity.	
	moveDirection[2] -= gravity * Time.deltaTime;

	//State what to do in each of the states.
	if (controller.isGrounded){
		switch(status){
			case idle:
				//Currently does nothing, but will hopefully have animation here.
				break;
			case walk:
				//Insert animation later.
				//Rotation handled later in script.				

				//Set the direction for movement.
				moveDirection = attackTarget.position - transform.position;
				break;

			case attack:
				//Insert "attack" animation later. Required for end use.
				//Rotation handled later in script.
				break;
			default:
				return;				

		}
	}
	Move();
}

function Move(){
	if(!wait){
		//Handle all movement in here.
		transform.LookAt(attackTarget);
		controller.Move(moveDirection * marManMoveSpeed * Time.deltaTime);
	}
	else{
	//Wait for assigned time and do nothing!
	Debug.LogWarning("Current status - waiting for "+idleTime);
	yield WaitForSeconds(idleTime);
	return;
	}
}

@script RequireComponent(CharacterController)

The custom script has the following settings in the inspector:

 Idle Time = 3.1
 Mar Man Move Speed = 5.291004
 Mar Man Rotate Speed = 3.399924
 Gravity = 50
 Attack Target = MainM (Transform)
 Chase Distance = 0.1
 Attack Distance = 0.01
 Controller = The Enemy (Character Controller)