The Isaiah Society's Usual Tactics

Ollivander had once suffered a burglary, and only after confirming Vizet's identity as a "Guardian" did Dumbledore reveal the details.

The thief had been a Canaan Wizard, and the stolen item had been the "Wand Ledger," which recorded information on wizards and their matched wands.

Although that Canaan Wizard had later been caught, the Wand Ledger was no longer on him, and he had been placed under a powerful Obliviation Charm, losing all his memories.

Aside from that, the Previous Guardian, Serena Pendragon, had written Vizet a letter, in which she had mentioned this sentence:

Just as I sensed that you had obtained your wand, the Isaiah Society, because of the commotion in Diagon Alley, likewise became aware that a new Guardian had been born, and obtained your name from Mr. Ollivander.

Combining what Dumbledore had revealed with the letter Serena Pendragon had left behind, it was easy to arrive at one conclusion—

The Pure-blood Family members planning to march in protest this time were not in the same group as the Dark Wizards who had set fires in the camp;

Most likely, the Isaiah Society had discovered that someone was preparing to cause trouble, so they used the Imperius Curse to control a group of Dark Wizards, and while the Pure-blood Family members were marching in protest, they escalated the situation through arson and created chaos.

As for why the Isaiah Society wanted to do this, Serena Pendragon, who had fought against the Isaiah Society all along, would clearly understand the reason better.

Thinking up to this point, Vizet sorted through the conclusion he had just reached and wrote it in Serena Pendragon's Notebook.

Serena Pendragon's reply came faster than expected. Not surprising at all. The Isaiah Society is exactly that kind of group. Otherwise, how could they have