As the saying goes, when you hit someone, don't hit their face so that you can meet them again another day; when you insult someone, don't strike at their weaknesses, always leave some room for face-saving in public.
But 'Half-Face,' or better said, John Neville, did not seem to acknowledge these conventional virtues. In the presence of Andrew Taylor, he brazenly brought up the recent episode from a practical class where the junior scion of the Taylor family avoided a challenge from Karen's family and passively declared a truce, causing the atmosphere in the entire lounge to become awkward.
In Alpha Academy, especially among the aristocratic disciples, the sense of 'honor' always occupies a delicate position. Two unfamiliar wizards can become close friends because of shared 'honor', or they can be adversaries for life because of a small blow to their 'face'.
That's why most wizards of Alpha are always cautious when they meet for the first time.