"I don't think it was an unwarranted presumption. And regardless, stealing a magical item from another magus is depriving him of his magical power, which is a violation of the Code as well. Now, if Vulcanus never reports it stolen, then there is no issue. But if he does, I will have to report that I was aware of your, and Antoine's, intentions, and strongly urged you to not go through with this.
As for whatever you and Vulcanus may have done in the past, I can't comment as I was unaware, but I am becoming more concerned with the happenings at this covenant.
In regards to Fleur, yes you are correct, she said Durenmar; it's been a long day. As for Vulcanus hiding his apprentice, he can of course do that. But if he does so, Fleur will have the right to go to his tribunal's senior quaesitor, at which point they will likely find him to be in violation of the mandate in the Code that states, 'I concede the right of Bonisagus to take from me any apprentice he may find helpful in his studies.' Hiding an apprentice after a Bonisagus has officially claimed one's apprentice would violate this tenet quite clearly."