Proper way of reversing animation playback in Unity when using legacy animation system ('Animation' component; when you need to play it backwards).

ReverseAnimationLegacy.cs

using UnityEngine;

public class ReverseAnimationLegacy : MonoBehaviour
{
    Animation Animation;

    void Start()
    {
        Animation = GetComponent<Animation>();
        Animation["walk"].speed = -0.25f;
        Animation["walk"].time = Animation["walk"].length;
        Animation.Play("walk");
    }
}