A hoof

You both gape in shocked disbelief at her hand. Or more accurately her hoof.

It is black and equine, with an iron horseshoe nailed to the underside. She shakes it as if it was a glove and she can fling it off but all that happens is she bashes your doorframe knocking a chunk out of the wood.

"Holy shit!" She gasps prodding the hard insensitive hoof . "This is..."