Abasdarhon's Castle

Maylin was about to express her sympathy to the monastery, but Cezan, who jumped into the conversation, deprived her of this opportunity. So, she rolled her eyes in sync with Izemberta. However, she did it subtly and not as demonstratively as the curious interlocutor.
“It’s a pity that this happened,” the collapse mage noted. “It’s so offensive and unpleasant when other followers of a particular magical school suffer because of some mentally unstable individuals. Following that logic, for example, one should also ‘look askance’ at all masters of archery, because now the Lafirians, most of whom are archers, are committing no less atrocities! But no one does that...”
So, what’s the deal with the information? What kind of blood magic is this, because I don’t quite understand. And I’m mentally checking her real involvement in the incident at the monastery.