system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] What were the "Really advanced defensive magic, probably, powerful countercurses, anti-jinxes" Hermione was talking about?

Ron also speculates about Spectacular hexes and Jinxes when talking about what Dumbledore is likely to teach. 

What were they talking about?
gpt
Probably something along the lines of what he would have used when fighting Voldemort in the Ministry, where you had magical barriers stronger than the standard basic one, or the multilayered protection spell that would be cast on Hogwarts itself later on.