Can´t find the infinite loop in this script

Hi, I´m making a game where my character should be able to hit, and only change to idle state (or any other anim state) if the "hit animation" ends. To achieve that I used an event function and a boolean . The thing is that, if I tap rapdly the "S" key (really fast, probably matching the exact frame where the animation event function gets called), the player freezes at the last frame of the hit animation, not the game, but the player. I guess it is an infinite loop since the console doesn´t notify anything. Any ideas??

 using UnityEngine;
 using System.Collections;
 
 public class leono : MonoBehaviour {
 
     public float moveSpeed;
     private Animator animator;
     private bool fighting;
 
 
     void Awake () {
         animator = GetComponent<Animator>();  
     }
 
     // Use this for initialization
     void Start () {
         
 
     }
     
     // Update is called once per frame
     void Update () {
 
 
         //Player hit
         if (Input.GetKeyDown (KeyCode.S)&& !fighting) {
             Debug.Log (" fighting true ");
             fighting = true;
             animator.SetInteger ("leono", 2);
         } 
 
         //Player move right
         else if (Input.GetKey (KeyCode.RightArrow) && !fighting ) {
             transform.localScale = new Vector3 (1f, 1f, 1f);
             animator.SetInteger ("leono", 1);
             GetComponent<Rigidbody2D> ().velocity = new Vector2 (moveSpeed, GetComponent<Rigidbody2D> ().velocity.y);
         }
         //Return to idle from moving right
         if (Input.GetKeyUp (KeyCode.RightArrow)&& !fighting ) {
             animator.SetInteger ("leono", 0);
         }
         //Player move left
         else if (Input.GetKey (KeyCode.LeftArrow)&& !fighting ) {
             transform.localScale = new Vector3 (-1f, 1f, 1f);
             animator.SetInteger ("leono", 1);
             GetComponent<Rigidbody2D> ().velocity = new Vector2 (-moveSpeed, GetComponent<Rigidbody2D> ().velocity.y);
         }
         //Return to idle from moving left
         if (Input.GetKeyUp (KeyCode.LeftArrow)&& !fighting ) {
             animator.SetInteger ("leono", 0);
         }
 
 
     }
 
     //This function gets called at the end of the animation with an animation event
     void defaultState (){
         fighting = false;
         Debug.Log (" fighting false ");
         animator.SetInteger ("leono", 0);
 
     }
 
 }