My advy heard the noise while in Nightscree, he alerted the hunters of Dwilight and then Glaumring knew about it IG since he is in the hunters guild to. Later because I think Zuma stuff is special I shared it with the forum for anyone who is interested in Zuma stuff. Just roleplay that you heard a rumour about screaming Daimons. Its not a big deal or even that secret it was meant to get out or they wouldn't have broadcast it.
Nope, you're right - not a big deal. But big deals HAVE been spoiled for people in the past, so nice idea to adopt a way of letting players enjoy things "at their own pace", so to say.