"A hair-trigger situation" is sometimes just a figure of speech, but sometimes it is a stark reality.
Because Ye Feng needed to clear out some space for his Portable Immortal Field, Hogwarts being on a hair-trigger was no longer a figure of speech, but a literal reality—the plants and trees around Hogwarts were genuinely attacking people.
Fortunately, there weren't many of these unusual plants. Within just two or three days, everyone had identified all of them, gradually figuring out their habits and establishing a safe distance.
Chapter 301