I've always thought that Sabrina was being treated by Dr. Reeves, whom we first met in the very first story arc. Dr. Reeves treated Roger after his car accident long ago but has survived by wisely staying off screen ever since.
If Julia can be both an expert on blood and vampirism and a psychologist, I suppose Stokes can also have medical interests besides his expertise in spells and the occult.
Even now, Sabrina refuses to betray Chris. Maybe Julia prescribed enough sedatives for Chris that he simply was locked into a padded room to sleep them off when the moon was full. How much time is supposed to have gone by in 1969 between Barn's departure to 1897 and his return? Do we know?
Barn is distant and cold to everyone, including his "dear friend," Julia, who is so overjoyed to see him back in 1969 that she doesn't realize he's given her only a perfunctory, one-handed embrace. No wonder he gives Chris the bum's rush. He gives Julia a brief account of Petofi, Quentin, and Amanda. Julia asks about the portrait. I’m very tired, Barnabas announces abruptly. He gets up and retrieves the Leviathan box from the mantel. Julia asks about it. I got it in the past, he replies. She reaches for it, but he snatches it out of her reach. You mustn’t touch this, he warns her. It happens to be very old. He sets the box on a table. Julia can’t help staring in amazement at his behavior and manner. [But if he didn’t want to draw her attention to the box, why did he put it in such a conspicuous spot and then pick it up?]
Julia excitedly tells Barnabas that she may have found a way to help Chris. Oh, yes, Chris, Barnabas replies distantly, as if Chris wasn't one of the primary reasons for his trip back to 1897. Julia says, It was impossible to keep Chris at the mausoleum, so I moved him to Windcliff, but he has just signed himself out. I have reason to believe Charles Delaware Tate is still alive. He would be almost a hundred, Barnabas says dismissively, and totally useless. Julia is arguing that they have to make sure when Chris knocks on the door and almost immediately barges right in. He brings the alarming news that Carolyn has seen Sabrina. If she talks-- Suddenly he realizes that Barnabas has returned. I desperately need your help! he says, relieved. Barnabas is just as cold to him as he was to Julia. With no emotion whatever, Barnabas says, I was just about to tell Julia my conclusion. Chris waits eagerly. I do so with regret, Barnabas adds. Chris’s face falls. Barnabas says calmly, In all the time that I was in the past, I found no solution for you. I'm afraid that there is nothing that I can possibly do for you. Chris is stricken, Julia is dumbfounded. Barnabas again pleads fatigue and goes upstairs. Hoping to make up at least slightly for Barnabas’s inexplicable behavior, Julia offers to walk Chris back to the cottage. Just outside the door, Chris says, I can’t believe he meant that. Julia answers, I don't know whether he did or not! I do know that something has happened to him. He has undergone a frightening change. There was no reason for him to lie to me! She explains, He told me that he returned from the past the same way that he went there, through the I Ching. That would mean through the cellar. But that is not possible--because I locked the cellar door from the outside. Go back to the cottage, Julia tells Chris. I will stay and get to the bottom of the mystery. I promise to explain tomorrow, but there is something I have to do here. After Chris sets off, Julia looks at the Leviathan box. I wonder why Barnabas brought that box back from the past. Julia thinks to herself. He didn’t want me to touch it. There must be something inside it--something that will explain why Barnabas isn’t himself anymore.
Quietly Julia pushes the door open and shuts it behind her as she reenters the Old House. She makes sure Barnabas isn’t about to come downstairs, then goes over to the table where he had set the Leviathan box. She hefts the box to test its weight. Gradually she becomes aware of the sound of slow, heavy breathing--coming from _inside_ the box. She sets it back down and tries to open it. When her attempts prove futile, she spots a key on the table. She puts the key into the keyhole on the box..........
