BarAnimation.cs

public class BarAnimation : MonoBehaviour
{
    [SerializeField] private SpriteRenderer sprite;
    private readonly Subject<Unit> subject = new Subject<Unit>();

    public void Start()
    {
        subject.Select(_ => Anime.Play(new Vector3(1.5f, 1.5f, 1.5f), new Vector3(1f, 1f, 1f), Easing.OutElastic(TimeSpan.FromSeconds(0.5f))))
            .Switch()
            .SubscribeToLocalScale(sprite.transform)
            .AddTo(this);
    }

    public void OnHitBall(Ball ball)
    {
        subject.OnNext(Unit.Default);
    }
}