It's... a shock, to say the least. To find his hands knocked away where he had been trying to gently goad her to lay down is... decidedly unexpected. The look on his face clearly displays as much, along with a confusion-- a spike in that concern.

"...Caterina, you're-- not... not making sense."

It's a soft effort to dissuade her from the path she's seemingly chosen with force. He has no idea why she's gotten such an idea into her head, but relying on Kampfer? The mere suggestion galls him. She would be safer in a pit of vipers than so much as extending a finger to that man.

"Maybe it's... the fever. You can't really mean that you want Isaak to help you."

Could she...? There's simply no way...