showDeathState() {
    let showDuration = 0.0;

    if (this.canChangeState()) {
      this.setStateLocked(true);

      this.showNoState();

      this.playSoundDeath(this.sdkCard);

      showDuration = CONFIG.FADE_MEDIUM_DURATION;
      this.destroy(showDuration);
    }

    return showDuration;
  }
Shows entity death state with fade out.
@returns {Number} duration of show