Developing the Attack state and more

The Attack state is entered when the zombie arrives within the attack distance to the player. During this state, the zombie repeatedly attacks the player until either the player dies or the player leaves the attack distance:

Attack state

Consider the following code:

    //------------------------------------ 
    public IEnumerator StateAttack() 
    { 
        //Run attack animation 
        ThisAnimator.SetInteger("AnimState", (int) ActiveState); 
        //While in idle state 
        while(ActiveState == AISTATE.ATTACK) 
        { 
            //Look at player 
            Vector3 PlanarPosition = new Vector3(PlayerTransform.position.x, ThisTransform.position.y, PlayerTransform.position.z); 
            ThisTransform.LookAt(PlanarPosition, ThisTransform.up); 
            //Get distance between enemy and player 
            float Distance...