It's a little bit of acting, and a little bit of letting the mask drop - Kronid can't metabolize anything but blood, and so his body is reacting to the tea and fried dough as though he had taken a bit of poison.

"I...yes, I think I do. I'm sorry, I - I have a blood condition, and sometimes it...it causes problems."

All true, technically.

"A guest room would be...would be good, if it isn't too much trouble. A quiet place...please." He rises to his feet, swaying a little, but stable enough.