"Lucius said Macnair is more likely to use an actual physical weapon than an old magic curse." Hermione said thoughtfully.  Since Macnair had been Buckbeak’s would-be executioner, that fit with what she knew about him, but since he was a Death Eater she could imagine him using the Dark Arts as well – most likely a killing curse, though.  This looked as though Hannah had fallen victim to the same old magic curse Dolohov had used on her, and that had been used on the previous two victims, but she couldn’t be sure until the body was examined.