[Fifteen Minutes to Portal Activation. All Vessels, please hold your position until the Portal is open, in compliance with safety protocols established by Alliance Officials.] Admiral Penner broadcast on all the standard hailing frequencies.
They hadn't had any issues with ships trying to do dumb things in the past, but there was always the first time, and she didn't want to do the paperwork for tearing apart a commercial transport with a Portal.
Not only would it be a PR nightmare, but it would bring them no end of nightmares in the form of corporations filing complaints against their Portal Technology, either in an attempt to get it banned or to get the schematics so they could steal it.
Most of the population of the ship didn't even notice when they first began to move. Only a few very sensitive species, and the ones watching the exterior monitors, could tell that Absolution was moving.