Harry was running flat out.
He had never hated his own weakness as much as he did now.
If he were as capable as Albert, he could have fought alongside Dumbledore instead of serving as a mere errand runner.
Harry also knew perfectly well that someone had to notify the professors and let everyone know what was happening at the school, so they could rush to the Astronomy Tower to support Dumbledore.
At the time, only Harry and Dumbledore had been in the office. In the end, it was his job to do it. It was unrealistic to expect everyone to notice that something was wrong on their own.
Yet for some reason, Harry felt deeply uneasy. Of course, he trusted Dumbledore to handle the situation, but he did not dare underestimate Malfoy's scheme. Malfoy had been preparing for an entire term, and it was clearly aimed at Dumbledore.
Could he really not see it? A conspiracy targeting Dumbledore.
Would Malfoy dare act so rashly without any confidence in his chances?
Harry had never believed Malfoy was stupid enough for that. He must have had something to rely on.
No matter how formidable someone was, they still had to fear schemes and being targeted.
Voldemort was the perfect example. Look at the once-invincible Dark Lord—Albert had tormented him so badly that he no longer even dared show himself.
With the help of Felix Felicis, Harry's stamina and explosive power had become extraordinary, but after sprinting all that way, he was still panting from exhaustion.
According to the original plan, he should have gone to Professor Flitwick's Charms office on the eighth floor of the West Tower. But it was far too distant from the Headmaster's Office, requiring him to cross the fourth-floor corridor of the castle to reach the West