That had Loki's attention, and brought a sly smile. "Do you now? And what is blood magic like in your world?" How was the other familiar with it, too...

Truthfully the Asgardians rarely paid attention to Midgard, but Loki knew (and had experienced) their being worshipped as Gods. And sometimes that worship took the form of sacrifices as a type of blood magic to try and sway their chosen 'god' to a petitioner's goals. In its way, blood was power...