Aragog in the box suddenly went still. Its eight legs no longer scraped against the wooden boards. Its body curled into a ball against the corner of the box, like a black, furry, trembling sphere. Hagrid sensed its fear—not because it was shaking, but because it did not even dare to shake. Its legs were stretched taut, like eight fully drawn bowstrings that could snap at any moment.
Hagrid looked at Aragog in the box, then raised his head to look at the darkness ahead in the corridor. There was something at the end of the corridor. Not something he could "see," but something he could feel. His half-giant blood gave him certain giant instincts—an intuition for danger, a sense for powerful creatures. That sense told him there was something ahead. Something huge, something ancient, something hungry.
In the portraits along the corridor walls, people were watching him. Not with curious looks, as though they wanted to strike up a conversation, but with bated breath and silent fear, as though they were watching someone walk a tightrope. They knew what was inside the walls. They had been at Hogwarts for a long time, longer than any living professor. They knew what that voice meant.
Hagrid took a step forward. Aragog suddenly recoiled inside the box, its legs scraping frantically and sharply against the wood. Hagrid stopped and looked down at it. Aragog's eyes were bright. Hagrid stood there, hesitating. Dumbledore had said not to take that path. Not that one path could not be taken, but that those paths could not be taken. There were places in the castle where not only students should not go, but even professors rarely entered.
Not because there were forbidden curses there, nor because there were traps, but because there was something there. Something