Help with 2D topdown knockback

Hello! i am having a problem with my 2D topdown game, i want to make a slime knockback the player, and i can´t do it work like i want to, i want it to knockfrom right to the left, up to down ETC. but it only knocks from right to left and left to right, i have tried many things i will add the playermovement and the hurtplayer script, also the AI script. AI:

 using UnityEngine;
 using System.Collections;
 
 public class AI : MonoBehaviour {
     
     private bool attacking;
     public float attackTime;
     private float attackTimeCounter;
     private Vector3 Player;
     private Vector2 Playerdirection;
     private float Xdif;
     private float Ydif;
     private float speed;
     private int Wall;
     private float distance;
     private float distanceFromPlayer;
     Rigidbody2D rb;
     public float Range = 5;
     public float Speed;
     Animator anim;
 
     // Use this for initialization
     void Start () {
         rb = GetComponent<Rigidbody2D> ();
         Wall = 1 << 8;
         speed = Speed;
         anim = GetComponent<Animator> ();
     
     }
     
     // Update is called once per frame
     void Update () {
 
         distance = Vector2.Distance (Player, transform.position);
         Player = GameObject.Find ("Player").transform.position;
 
         if (distance < Range) {
 
             Xdif = Player.x - transform.position.x;
             Ydif = Player.y - transform.position.y;
             Playerdirection = new Vector2 (Xdif, Ydif);
 
             if (!Physics2D.Raycast (transform.position, Playerdirection, 5, Wall)) 
             {
                 rb.AddForce (Playerdirection.normalized * speed);
             }
         }
     }
 }

player movement

 using UnityEngine;
 using System.Collections;
 
 public class PlayerMovement : MonoBehaviour {
 
     Rigidbody2D rbody;
     Animator anim;
 
     private bool attacking;
     public float attackTime;
     private float attackTimeCounter;
 
     public float knockBack;
     public float knockBackCount;
     public float knockBackLength;
     public bool knockFromRight;
     public bool knockFromUp;
     public bool knockFromLeft;
     public bool knockFromDown;
 
     // Use this for initialization
     void Start () {
 
         rbody = GetComponent<Rigidbody2D> ();
         anim = GetComponent<Animator> ();
 
     }
     
     // Update is called once per frame
     void Update () {
         if (knockBackCount <= 0) {
             Vector2 movement_vector = new Vector2 (Input.GetAxisRaw ("Horizontal"), Input.GetAxisRaw ("Vertical"));
 
             if (movement_vector != Vector2.zero) {
                 anim.SetBool ("iswalking", true);
                 anim.SetFloat ("input_x", movement_vector.x);
                 anim.SetFloat ("input_y", movement_vector.y);
             } else {
                 anim.SetBool ("iswalking", false);
             }
 
             rbody.MovePosition (rbody.position + movement_vector * Time.deltaTime);
             {
                 if (Input.GetKeyDown (KeyCode.J)) {
                     attackTimeCounter = attackTime;
                     attacking = true;
                     anim.SetBool ("isattacking", true);
                 }
                 if (attackTimeCounter > 0) {
                     attackTimeCounter -= Time.deltaTime;
                 }
                 if (attackTimeCounter <= 0) {
                     attacking = false;
                     anim.SetBool ("isattacking", false);
                 }
             }
         } else {
             if (knockFromRight)
                 rbody.velocity = new Vector2 (-knockBack, 0f);
             else
                 knockFromRight = false;
             if (knockFromLeft)
                 rbody.velocity = new Vector2 (knockBack, 0f);
                     else
                 knockFromLeft = false;
             if (knockFromUp)
                 rbody.velocity = new Vector2 (0f, -knockBack);
             else
                 knockFromUp = false;
             if (knockFromDown)
                 rbody.velocity = new Vector2 (0f, knockBack);
             else
                 knockFromDown = false;
             
             knockBackCount -= Time.deltaTime;
         }
             if (knockBackCount <= 0)
             {
                 knockFromRight = false;
                 knockFromLeft = false;
                 knockFromUp = false;
                 knockFromDown = false;
             knockBackCount = 0;
             }
         }
     }

hurtplayer

 using UnityEngine;
 using System.Collections;
 
 public class HurtPlayer : MonoBehaviour {
 
     public int damageToGive;
     public GameObject damageNumber;
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 
     void OnCollisionEnter2D (Collision2D other)
     {
         if (other.gameObject.name == "Player") {
             
             other.gameObject.GetComponent<PlayerHealthManager> ().HurtPlayer (damageToGive);
             var clone = (GameObject)Instantiate (damageNumber, other.transform.position, Quaternion.Euler (Vector3.zero));
             clone.GetComponent<FloatingNumbers> ().damageNumber = damageToGive;
         }
     }
 
         void OnTriggerEnter2D(Collider2D other)
         {
         var player = other.GetComponent<PlayerMovement> ();
         player.knockBackCount = player.knockBackLength;
 
         if (other.gameObject.name == "Player") {
 
             if (other.transform.position.x < transform.position.x)
                 player.knockFromRight = true;
             if (other.transform.position.x > transform.position.x)
                 player.knockFromLeft = true;
             if (other.transform.position.y < transform.position.y)
                 player.knockFromUp = true;
             if (other.transform.position.y > transform.position.y)
                 player.knockFromDown = true;
         }
         if (player.knockFromRight == true) 
         {
             player.knockFromDown = false;
             player.knockFromUp = false;
              player.knockFromLeft = false;
         }
         if (player.knockFromLeft == true)
         {
             player.knockFromDown = false;
             player.knockFromUp = false;
             player.knockFromRight = false;
         }
 
             if (player.knockFromUp == true)
         {
                 player.knockFromDown = false;
                 player.knockFromRight = false;
                 player.knockFromLeft = false;
         }
         if (player.knockFromDown == true) 
         {
             player.knockFromRight = false;
             player.knockFromUp = false;
             player.knockFromLeft = false;
         }
             
     }
   }