diff --git a/js/game.js b/js/game.js
index 45e7754..9f82422 100644
--- a/js/game.js
+++ b/js/game.js
@@ -832,10 +832,9 @@ export class Level {
         if (actor.cell === goal_cell)
             return;
 
-        // TODO undo this stuff?
-        actor.previous_cell = actor.cell;
-        actor.animation_speed = speed;
-        actor.animation_progress = 0;
+		this._set_prop(actor, 'previous_cell', actor.cell);
+		this._set_prop(actor, 'animation_speed', speed);
+		this._set_prop(actor, 'animation_progress', 0);
 
         let original_cell = actor.cell;
         this.remove_tile(actor);