It's plausible, since everyone is infected, that the idea of eating human flesh is less repulsive post-apocalypse.
Could be a good shout. The guy who does all the talking does have the air of a doctor or medical student of some sort.Methinks they are former doctors, otherwise the patient (!) could die because of blood loss, considering the operation.
But that wouldn't explain how they can track the group through the woods and Daryl can't track them. Or why the (T-Dog#3) black guy went off to have a cry on his own.