((this whole post OOC)) Tranquillina's not much good at D: Concentration anyway; I'm pretty sure that this shocking twist will end the spell, possibly even knocking her out of her chair.
This is going to make her ... furious, but that's not exactly right. This is about the deepest humiliation she could imagine: her first mater, waltzing in and in less than a week realizing something crucially important that had eluded Tranquillina for five years. And (in her eyes) then Cumhachd takes the action that would make her look as bad as possible. Yoinking a bright Gifted man out from under her, on the doorstep of her own covenant! This might, to understate the matter, cause a setback to any planned negotiation for a truce between them 
From the player's perspective, I could have sworn I had Loys tested for the Gift back when he was introduced. But I searched the forum pretty thoroughly, and I must be making that up. (Maybe I rolled some dice offline or something....) Viscaria definitely suggested testing him for the Gift. Noting Tranquillina's defensive reaction, I suppose it's consistent to think that she never actually did so. (She's not really ready for an apprentice anyway, looking at her Arts.)
Anyway, clearly there's a dramatic story unfolding now, and there's no reason to derail that. I just feel a little dumb (that's nothing next to how Tranquillina feels!).