I would casually walk up behind you then grab your arm and force it back in till it breaks at the elbow then commence to tear it completely off upon witch time I would smash the protruding bone of your dismembered arm on a rock so as to shatter the bone I would then begin the job of cutting through the protective layers of your abdominal cavity with the shattered end of the bone then insert my mstar fish through the breach I had made and take hold of your Jejunum and tear it loose from your Duodenum and Ileum and then strangle you with it.
tl;dr I would strangle him with his own intestinum tenue