It was after she disapparated that Voldemort suddenly felt something amiss. It didn't take too long for him to realize that the woman had nicked his golden potato. Baring his teeth in anger, he waved a hand through the air, summoning his magic to detect where she was. Had his Horcrux been nicked by someone else, it would've been much harder for him to retrieve it. But since their magic was now connected, it would make Summoning what had his magical imprint back to him much more easy.