In line with her comments regarding her personal bias prior to hearing arguments, she determined that magazines aren’t covered by the 2A and even if they were, banning them fits within history and tradition, because… um… yeah, it gets a bit muddy after that. Still waiting on Benitez to issue the opinion in his case.
I believe her argument was that “in use” meant to her like activity shooting threats with 11th-30th rounds in the magazine.