She was completely at their mercy when she was alone in that tent with Malfoy. It would have been quite a boost to the morale of the Resistance if they were finally able to capture or kill Lord Voldemort's prized pet. Hermione was aware that there had been a call for her head for years. Part of Antonin's insistence that she stay away from the Resistance and their allies was his concern that she would be a prime target. She represented everything that the rabble was fighting against. More would rush to their ranks if they could prove that they were able to overcome someone like her.