Late that night, the Gryffindors who had witnessed everything from the Astronomy Tower chattered in the common room, discussing everything they had just seen up there.
The Fat Lady's portrait swung open.
Professor McGonagall walked in, her expression grave. The young wizards had lost their usual fear of her stern authority and crowded around her, all asking at once what had happened.
While Professor McGonagall was surrounded, Su Er, who had returned after escorting Hagrid out of the Castle, quietly slipped inside. He found the familiar girl in the familiar corner and swiftly climbed onto her legs, which had grown long and slender without losing their fullness.
"I saw you," Hermione whispered, weariness on her face.
"That was you, wasn't it?"
Su Er gave a slight nod.
"You're so strong. Those people Umbridge brought were Aurors, right? You beat them so easily."
Actually, those five people were not Aurors. Real Aurors were not such empty suits. To be precise, these people were merely Hit Wizards...
That was what Professor McGonagall later explained to him.
Yes, Professor McGonagall had known all along that Su Er was "alive." She was also one of the core members of the Order of the Phoenix.
While Hermione and Su Er were communicating, Professor McGonagall had already quelled the crowd of intensely curious young wizards and urged them to hurry back to bed, because they had their History of Magic exam the next day.
It was only a single night, and it passed in a flash. The next day was bright and sunny.
Umbridge did not appear at the final exam in the Great Hall, because the night before, she had taken Su Er's Stunning Spell head-on and was still lying in the Hospital Wing. Oh, of course, so were several of her colleagues.
Madam Pomfrey