I tried it today and I couldn't catch anything. It did work in the past, but for some reason ATM it's not working as intended. Like @Biff.5312 says, it's a lot easier to throw water on the drunk Norn ?
But they do I point you to this thread with something said hearts have daily.https://en-forum.guildwars2.com/discussion/33466/flames-of-war-legendary-torch#latest And like the OP of that thread said, do the HoT option. And this is for a legendary. It's not supposed to be easy.