First, because Daphne has always had excellent contacts within the Dark Lord's inner circle thanks to her arranged marriage to Mulciber Junior, which will surely benefits us when we interrogate her. Second, because, as I also know from Blaise, Daphne will be reunited with her sister after the interrogations, which actually warms my little, black heart. And third, because Daphne's quasi-staggering straight into the arms of a Resistance fighter makes me suspect that rumors about the possibility of defection are slowly but surely spreading among the Death Eaters.