Arkham Origins "Lesser Known" Easter Eggs - Part 1 (Hush/Manbat/Prometheus)

Taking a break from song-writing and powering through Arkham Origins. Such an awesome game! :)

Here are some of the lesser known easter eggs I've found in Arkham Origins, which thus far has not been reported or does not have significant proof on IGN. The three I'm focusing on here are:
1) Hush - hints found in Bane's hideout and with a conversation with Alfred (also hints to the Abramovici brothers in Arkham City).
2) Manbat - this has been reported on various forums, but I am not sure if anyone has been able to trigger all conversations from Alfred referring this creature. I found 7 different conversations - perhaps there could be more, or even a sighting of the creature?
3) Prometheus - this can be found in the courthouse after the Anarky fight.

Warning - there are potentially some spoilers here. I've noted them down in the video itself.

UPDATE #1 - Separation of the twins (thanks Marco Bastos for the heads up)
Turns out that the separation of the twins was detailed in the Arkham Unhinged comic series. In it, Thomas Elliot was indeed the one that separated the twins. HOWEVER, Harley Quinn was already with the Joker at the time that they acquired the twins. In addition, at the time of the operation to separate them, Harley Quinn was wearing the same outfit as she did in Arkham City, hinting that this could have occurred sometime between the events of Arkham Asylum and Arkham City. However, in the comic book arc, Iceburg Lounge was getting visitors from non-criminals, meaning that Arkham City has not been set up yet. Nonetheless, this proves that the mention of the twins here could not be the Abramovici brothers, unless Origins messed up the timeline set up in Unhinged. I wouldn't be surprised considering we got Identity Thief and future Killer Croc design newspaper clippings in Bane's Hideout...

More well-known easter eggs can be found here:
http://www.ign.com/wikis/batman-arkha...
http://www.ign.com/wikis/batman-arkha...