Elwood stood pondering the first statement Nathan had said, he had mentioned the woman's quickness, this made him have doubts that she was a woman. It could have been a 'he' transifigured to look like a woman, or a woman transfigured to look like an older woman, or either one after consuming polyjuice potion to make themselves look like someone else. He verged on saying this, but moved against it, he would say something when the time was right, or when he had evidence to say that at least one of his theories was right.