I agree that Julia wanted to keep her composture in front of Petofi. I think Petofi relished telling Julia about Barnabas' death. He's as cruel as he is powerful, loving to control others (Quentin) or to watch them suffer (Julia). I'm surprised though that Petofi didn't think to take Julia as prisoner again, especially now, because as he pointed out, she no longer has Barnabas to come and save her.
He still wants to go to 1969 very badly, and even though he realizes now that Julia had told the truth about I-Ching experiences, he could have used her as a guinea pig to test out the doors, just as he had Beth do a few episodes ago, and talked Tim into doing in this episode.
Speaking of Tim, he still wants to do ANYTHING to win Petofi's favor. He's behaving like such a pest by now though, that I'm surprised Petofi hasn't bewitched or frighten him to leave him alone by now.
Gag! Did anyone else want to puke when Quentin told Amanda he had never known love before he met her? It makes me sick! So all those times he told Beth he loved her was all a lie? Bad writers!