She said the words, and she didn't drop dead. Maybe she wouldn't, until the spell was completed--or maybe she wouldn't drop dead at all. At this point, Tiberius couldn't really claim to care much one way or another. He was going to proceed with the Vow, and if he had a wife left at the end of it, she'd be behaving herself for the foreseeable future. If she didn't survive the process, well, she was better off dead--and the quick death caused by the breaking of the Vow was likely far kinder than what she would receive at Tiberius' hands, if he were to discover independently that she'd been seeing someone else.

There would be an interrogation about that. But for now, the rest of the Vow needed to be performed. Tiberius had to glance at his notes, somewhat distracted by the delay in this last clause. "Do you vow not to perform any illegal activities or acts of dark magic, unless you inform me of said activities?" The wording could probably have been more formal on that one, but he'd been thrown out of his groove by this last little hiccup, so he was more or less reading from the paper this time.