Can't use Seas0npass to "Boot Tethered" an Apple TV 2 without an Internet connection?

I have successfully jailbroken my Apple TV 2 (iOS 5.1) with Seas0npass tethered using a macbook.  I want to bring the Apple TV to a location where there is no internet connection to play some video (Apple TV 2 running XBMC will be on a local network with a small NAS sharing the files).  However when I try to start Seas0npass it complains that there is no internet connection.  I would not have thought an internet connection would be required to just “Boot Tethered” (I would have thought and required files would be on the macbook’s local file system from the jailbreak).  Am I missing something, or do I just have to wait for the untethered jailbreak?