Although Ravenclaw Tower was not as tall as Gryffindor Tower, the corridor windows were still quite high.
A broad expanse of sky was visible from here. At that moment, a huge skull with a snake emerging from its mouth, formed from black smoke, appeared in the sky.
The Dark Mark!
Harry and the others' expressions changed immediately. They exchanged glances, then each used their own means to turn invisible.
Harry used the Left Hand of Chaos and Calamity, which was the most efficient. The instant he turned invisible, he was already out and heading toward the main building.
Harry and the others had played around with invisibility together before, only to keep bumping into one another.
To prevent that from happening again, they had come up with a solution some time ago.
A very simple little piece of contract magic allowed everyone who used it to clearly sense one another's positions.
Harry activated the contract magic as he turned invisible. A moment later, he sensed that ten people had completed the contract magic, allowing them all to know one another's positions.
Ten people?
Harry thought it over.
Me, Ron, Hermione, Lavender, Neville, Qiu, Luna, Cedric, Yi Qianqian... Who's the last one?
Could it be Rolf?
Hmm, that was possible.
The thought flashed through Harry's mind. Sensing that three of them were over by the staff quarters Luna had mentioned, he reckoned that was probably the case and immediately hurried outside.
Yet just as he reached the main building, something Harry found unbelievable happened.
Flames erupted into the sky from all over the castle at once. Almost instantly, the entire castle was engulfed in firelight.
"How could they? How dare they?" Ron's incredulous voice sounded beside Harry's ear. Although they had long known that the Death Eaters had entered Hogwarts to