Why is the TIE fighter that Poe and Finn steal tethered to the Star Destroyer?
When Poe and Finn try to escape they jump into a TIE fighter that is tethered to the dock. Is this a safety feature, or was it something like a fuel hose and they stole it into a mid refuel? Or was it a security feature to stop them being taken without authorization? As, it is noted on what seems to be the bridge that an "unsanctioned departure" was occurring
Anyway, was there anything that stated what it was that was tethered to it?