Isabella Hoopes looked as though she was having a ball haunting Quentin. Funny, I clearly remember not liking Edith much in 1969. I didn't know much back then!
Humbert Allen Astredo has a difficult job to do. Just a few weeks ago, he was a minion of the devil. Now he's a human being who was dealings with the devil, and he's got to make this human being a separate character in the eyes of the audience. His face is much less mobile as Evan Hanley. His mouth barely moves, and we never see Nicholas Blair's big smile. But when he starts performing the Satanic ceremony, he becomes as commanding as Nicholas was.
So Quentin hoped to use Jamison in the ceremony without harming him? He's kidding himself. I once watched a documentary whose exact subject I can't remember. A convicted murder was saying that anyone could end up committing murder. He had taken a gun with him to rob a gas station with no intention whatsover of using the gun, and lo and behold, he ended up using the gun and killing the gas station attendant. It could have happened to anyone! And here's Quentin taking Jamison with him to conjure up the devil with no intention whatsover of harming Jamison. Well, it looks as though Jamison may have gotten off scot-free, but if he has, that's pure luck.