Playing the part of the scared Slytherin Muggleborn was easy. Of course, Moody had his reservations. He had stated quite clearly that Hermione was a Slytherin (like, duh) and Slytherins were evil. Surprisingly, it had been Nymphadora Tonks that had come to her aid. She had yelled back that her own mother was a Slytherin pureblood that had broken out of that particular vicious cycle to marry at Muggleborn so, clearly Mad-Eye, not all Slytherins are evil.