Fred's own eyes narrow slightly they were told to relax. They should've just left him be after finding out about the fever. He does, however, cross his arms slightly but that knife was still out. It would stay that way the whole time the good doctor was there. He hears Jughead take a slightly shivered breath from the cold stethoscope and scowls slightly.
Jughead didn't want to do a damn thing right now. He shivers slightly when the damn thing is pressed to his back before taking a few deep breaths for the good doctor. After Connor does that, he moves the pillow and lays on his back. He's only barely noticed Fred with the knife.