Marcus tried to spit at her, but as soon as his mouth opened, Wolfe stuck an end of the [Binding Ropes] spell in his mouth, gagging him until he was out of the hallway. That turned out to be much more effective than the usual way of using the spell. It stopped him from speaking but didn't endanger his life like wrapping the rope around his neck to silence him did.
The Inquisitor layered a containment spell over Wolfe's ropes, so he dismissed them and let the large witch take the man away for interrogation while the Headmistress looked around the hallway with suspicion.
She had put a lot of effort into removing the sorts of traitors who could be a danger to her students from the staff, but if there were hidden ones among the security staff and the Professors, she would have a tough job ahead of her just trying to keep the Academy running.