[ He draws a deep breath, steadying himself back to detachment. This is nothing, this is a task coroners and surgeons perform every day, he has Geassed far more gruesome acts and he can handle actually cutting through the meat himself for once ]

Ahh… it appears that the horn is growing directly from the calcaneum - the heelbone. Rather than the horn be a distinct growth, the heelbone itself is changing colour and consistency across the entire bone…

[ He scrapes the knife against the bone, thinking to look deeper, but something about that wet noise and the friction finally turns his stomach completely. He drops his foot and the knife and scrabbles away from the table, grimacing hard as he fights back the sudden wave of nausea. He nearly clamps his hand over his mouth - but no, it’s covered in his own blood and flesh - and bolts for the bathroom on his tiptoes.

Very soon comes the sound of him being noisy sick into the sink ]