@Unregister
 public static void unregisterSpectateSign(HeavySpleef heavySpleef) {
   ExtensionRegistry registry = heavySpleef.getExtensionRegistry();
   registry.registerExtension(SpectateSignExtension.class);
 }
 @FlagInit
 public static void initSpectateSign(HeavySpleef heavySpleef) {
   ExtensionRegistry registry = heavySpleef.getExtensionRegistry();
   registry.registerExtension(SpectateSignExtension.class);
 }