createBubbleCommand () {
    const animBubbleCommand = new AnimeCommand(this.animationFn)
    animBubbleCommand.undoCommandFactory = () => {
      return new SyncFunction(() => {
        this.resetSpeechBubble()
      })
    }

    return animBubbleCommand
  }
@returns {AbstractCommand} command to play the animation revealing the speech bubble.