Credit: Gene Page/AMC Photo: Hershel Greene Brings Dr. S Some Tea on The Walking Dead Season 4, Episode 3: “Isolation”

Daryl Dixon (Norman Reedus), Tyreese (Chad Coleman), Michonne (Danai Gurira), and Bob Stookey (Larry Gilliard Jr.) have been on their medicine run to the veterinary school for what seems like a really long time considering so many people are sick, and as the sneak peek below shows, at least one person seems really close to death.

That poor, unfortunate soul is Dr. S, who gets a visit from Hershel Greene(Scott Wilson) in his sick cell. Dr. S tells Hershel to leave because he still has “a chance” but the old geezer won’t budge. “I’m not giving up on anyone,” he declares.

Then Dr. S resorts to his second order of business, ensuring that if and when he turns he’s kept away from the rest of the prison population.

Caleb (Dr. S’s first name) then coughs all up in Hershel’s vicinity, and the vet asks to get a good look at his patient. When Caleb looks up, the viewer and Hershel see his sweaty face, and bloodshot eyes. In short, it doesn’t look good for Dr. S. And since Hershel has been very close to him during his sickness, so we don’t have high hopes for him either.

Check out the sneak peek below and see for yourself!

The Walking Dead airs Sunday nights at 9 p.m. ET on AMC.