I have a problem playing an AudioSource

I'm trying to make a bullet play a sound when it hits a wall. The bullet currently has 2 AudioSources - one which plays immediately after a bullet is spawned (this one works) and another one called "Impact" which is supposed to play when I hit a wall. The problem is that I don't know how to properly write the script to make it play that sound.

This is the bits of code that I have:

 public class BulletController : MonoBehaviour
     {
         //some more variables
         private AudioSource ImpactAudio;
 
         // Use this for initialization
         [UsedImplicitly]
         private void Start()
         {
             //some extra things for the player
 
             //I debugged this and it does assign the correct AudioSource
             //to ImpactAudio
             ImpactAudio = GetComponents<AudioSource>()[1];
         }
 
         [UsedImplicitly]
         private void OnTriggerEnter2D(Collider2D otherCollider)
         {
             switch (otherCollider.name)
             {
             //some other cases
 
                 case "Block":
                     PlaySound();
                     //This part works - the bullets are actually destroyed by this
                     Destroy(gameObject);
                     BitBoy.ReloadBullet();
                     break;
 
                 default:
                     Debug.Log(otherCollider.name);
                     break;
             }
         }
 
          //This should(?) play the Impact sound
         private void PlaySound()
         {
             //This does write Impact in the console
             Debug.Log("Impact");
             //Nothing happens.
             ImpactAudio.Play();
         }
     }

I am pretty new to Unity, just started working, but after searching through some previous questions related to this I still don't have a solution.