Two errors with the chamber where La Magra is created. First, there are 12 members of the House of Aramus, but when Frost is viewing the program, it makes 20 noises when placing gliphs in the pureblood spots. Second, the blond, female vampire kills one of the purebloods BEFORE Frost turns into La Magra. How could it have worked with one of the purebloods missing?