It had sounded like such a good idea – sleeping gas, to drop everyone in Gringotts without a fight, perfect – but of course it didn't work that way in real life. There was no risk-free easy knockout gas in reality, so if they were to use chemical weapons, they'd have to work with what Muggle countries had created and stockpiled. Which were mostly rather dangerous and nasty. Hermione would have hoped the first time Muggle technology was used in the magical world would be to help the wizarding community. But no, it was weaponry that would first be used by wizards and witches. It made her sad.