Antonin watched dispassionately as Dona Tonks hit the floor. The poor girl really had no idea, did she?
When she spoke, he canceled the curse immediately and dropped to one knee next to Dora. "Here, Dora, take my hand," he reached out to her to help her back into her chair. "That was a less powerful curse than the one you used on me."
"I want you to think carefully about what you are planning on getting into. Do you think you could resist even a few minutes of a full-strength Crucio curse if Roddy wanted to ask you a few questions?"