At that point it isn't clear that Adrian is entirely himself - he was showing signs of being influenced by Jakob that night.
It's worth bearing in mind that a full 24 hours later Miriam sent Adrian a photo of Heidi tied up naked on her bed and he responded, "Do you deliver?" He still seems to be at ease with a lot of stuff he wouldn't have been before.
While it appears that Miriam did collect Amaltheia, we didn't see how it happened. She took Amaltheia to the fish shop saying there was someone she wanted her to meet, i.e. Heidi. That was the last sentence in that page, suggesting that Amaltheia meeting Heidi was significant. Did
Heidi have an effect on Amaltheia? I only wonder because, you know, she sent Heidi out as a gift to Réka and Weston.