Well, Zangetsu had actually intended to find the Ringmaster and give her a piece of his mind. The mess her mistake had left in everyone's souls was making him a little nauseous. He needed to know that wasn't going to happen again.

But that was when he thought she was pretty much immortal and unbreakable. As he follows the ashes, he can begin to sense that is not the case. She was falling apart. Literally.

And if SHE fell apart, then their deal would fall apart, too.

"You look like hell, boss," he says in his creepy reverberating voice. No 'hello' here, apparently. "Yer not gonna die on us, are ya?"