William waited, ignoring Z, until Bob removed the silencing charm so that he could speak.
"It's a monitoring spell," he told Bob, keeping his attention on Bob because if he looked at Z right now, he might curse her. "It was done by...a professional," he caught himself, because he wasn't throwing Gabe to the wolves in front of Z, who seemed desperately eager to seize any and all ammunition, no matter how grossly inappropriate it might be. "It's not tied to the curse or to Dark magic in any way, because you said explicitly that such a course of action would be unsafe."
Rather, in all honesty, it was because William hadn't found a way to make a containment spell feasible and Gabe hadn't been willing to let him try one regardless, but the point was, William hadn't gone against Healer's orders.
"You told me to be careful around New Year's," he reminded Bob. "This is a way of being cautious."