How stop a piece of code from running if the conditions are no more met.

Hello, I'm quite new to scripting and i need help with a piece of code. What I'm basically trying to do is that... Lets say I'm cutting a tree in a rpg game. If i move too far away from the tree, i want him to "stop cutting the tree".

 IEnumerator OnMouseDown() 
 {

     float distance = Vector3.Distance(transform.position, pelaaja.position);
     GameObject Player = GameObject.Find("Player");
     GameMaster gameMaster = Player.GetComponent<GameMaster>();

     if(distance <= 1.414214f && gameMaster.gatheringResources == false )
         {
         float choppingTime = Random.Range(chopMin, chopMax);
         print(choppingTime);
         gameMaster.gatheringResources = true;
         yield return new WaitForSeconds(choppingTime);


         Inventory inventory = Player.GetComponent<Inventory>();
         inventory.wood += 1;
         print("You Just Chopped a log");
         gameMaster.gatheringResources = false;
         Destroy(gameObject);
         }
     else
     {
         print("You are either too far or already choping") ;
     }
 } 

So basically what I'm trying to ask is that if the distance grows larger than 1.414214 while the yield is running, how do i make the rest of the code stop from running and instead print something like "you moved too far". I hope you can understand my question. If you need more info go ahead and ask. I'm guessing it has something to do with a while loop, I just couldn't get it to work

oh also if you wonder what "pelaaja" means, its just player in Finnish.