i wonder if either of them can even die. like think about it, nigo was born from a severed pinky... i don't think mere steel plates on MC's hands will be even close to enough. might need napalm, or if going cheap route knock the other out and put them in a barrel of quick dry cement before dumping it in a deep sea trench or some shit. maybe a volcano would work too.
also calling it now. nigo cut off parts of himself to make more clones off screen a LONG time ago.