Talk:Heroes and Monsters/@comment-32.209.96.250-20160209003600/@comment-2006510-20160209021312

For all we know, those mechnical parts might operate and be fueled by the body's normal energy processes, same as ours do - they not only attached it without problems after all, but it works as if those were his original parts.

As to what did so, my guess is he was bitten in half by something big... it's not just his chest and side either; his right leg showed metal as well, in the few places the clothes were torn