Despite the fact that she'd had the exact same thought multiple times since returning, she was flabbergasted that the words came out of her son's mouth. She didn't even know where he learned the story. It certainly wasn't one that was spoken of in public and she hadn't told him. Antonin knew the stories of her adventures at Hogwarts, but they both made the decision that Oliver didn't need to know them. Not until he was much, much older. Neither one of them wanted to give him any ideas while he was still studying at Hogwarts himself. He was already enough like his mother that they didn't need to help him figure out ways to get into trouble.