She released the spell on his mouth. He spat globs of blood onto the tile as he tried very hard to keep from breaking. It was difficult to remain calm in an interrogation, especially when one was all but certain they wouldn't be leaving it alive. Madam Dolohov had just as many, if not more, kills as the wizard Marcus followed around like a lovesick lapdog. He knew the odds of survival were slim. Likely it was the very reason he wasn't speaking. She had to change tactics.