A sudden sputtering sound issued from Keystone's lips, a bout of laughter that he (for whatever reason) tried to keep in. He waved away the grand gesture of intimidation the undead knight put to him, and gave up all pretense of holding back his mirth. 

He laughed. Loud and long and clear. He pounded his fist on the wall, even wiped a tear from one eye. He wasn't sure if he was royally screwed, or if this was just another step in the convoluted plot that was his life recently. 

"Boy, I'll tell ya, ya bony git..." intoned Keystone in a weary bass, "I ain't laughed so hard since I was a li'l girl. Really. Bra-sodding-vo. Look at y'self. You're about a menacing as a bloody housecat just now. And I'm not leavin', for a couple reasons what should be plain."

Keystone glanced around at his surroundings, really noting the subtle and not so subtle changes. 

"So let's have it, then. How 'bout you fill in a couple whys for me? I got time. Obviously you do. We can both use a rest." 

During the as yet one-sided conversation, Keystone kept his hand on the wall. Carefully, he tested his ability to manipulate and respond to Earth, pressing a fingertip lightly and trying to leave a mild indentation.