No one had informed on them. At least, none of the people who had signed the parchment that day had leaked anything.
Harry and Ron had made a point of checking on every one of them, and none had faces covered in festering boils.
"So this Inquisitorial Decree or whatever is just a coincidence?" Ron was not quite convinced.
"Maybe there were other people in the pub at the time? Or, um, by the door? Someone who heard us but didn't sign?" Ginny suggested tentatively.
"Someone could have been standing beside us, invisible," The twins suggested, offering an even more far-fetched but certainly possible theory.
For now, though, there was no way to confirm any of their theories.
In fact, however, Harry and the others still had not realized how serious the situation was.
After History of Magic, Harry and the others left the classroom in a daze. As he did most of the time, Professor Binns had delivered his steady lecture and left all the students drowsy.
Clearly, Umbridge, who had also graduated from Hogwarts, knew perfectly well what History of Magic lessons were like, so she had never once appeared in that classroom.
Umbridge had not come, but Angelina came rushing over.
More than half the Gryffindor students chose not to take History of Magic after their fifth year because it was simply too dull.
The remaining half did not like History of Magic either. They only took it because it was easier to coast through than the other advanced courses.
Angelina was a typical Gryffindor, so she no longer had to take History of Magic.
Her appearance here therefore came as something of a surprise to Harry and the others.
"You all know about that notice, right?" Angelina said as soon as she reached them.
"Yeah, it's