Calhoun's anger didn't simmer down. Unlike Madeline, who had the heart of an angel who could forgive people's action, he wasn't like that. He saw how Beth's hand had reached for the door only to fall back to her side. And he had also witnessed the scene after that, where Raphael had gone to extract some more memories of that time from Madeline.
Though it looked like Beth had not attempted to help Madeline, there were some factors to look at, like how it was their grandmother who had sent the men at Madeline so that her dark angel abilities would trigger again.
If Calhoun knew about this earlier, he wouldn't have left the old folks to die that easily. He would have ripped their eyeballs before torturing them until they wished death upon themselves. The question here was if Madeline's sister would have screamed for help if their grandmother didn't intervene in the situation by putting a spell on the hut.
