'what you 've got here , aaron , is a brilliant neurosurgeon descended from a family of witches , who can kill people just by looking at them ; and on some level she knows it , she has to , and she spends every day of her life making up for it in the operating room , and when she goes out on the town it 's with some hero who 's just saved a kid from a burning attic , or a cop who 's stopped a drunk from stabbing his wife .