Enemy moving away from the player but looking at them

EnemyController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EnemyController : MonoBehaviour
{
	private Rigidbody rb;
	private Transform playerTransform;
    // Start is called before the first frame update
    void Start()
    {
       rb = GetComponent<Rigidbody>();
       playerTransform = GameObject.FindWithTag("Player").transform;
    }

    // Update is called once per frame
    void Update()
    {
       transform.LookAt(playerTransform);
    }

    void FixedUpdate()
    {
        rb.velocity = transform.TransformDirection(Vector3.back);
        
        Debug.Log("rb vel: " + rb.velocity);
    }
}