I think the driver (Bixby, if we are now presuming it's him) is a bit cautious over Victor (I don't think he knows who it is at this point), but I feel he is probably a bit dissilusioned with life under the Mallers so he didn't immediately go to Scratch/Durai/Whoever to report them and get them dealt with. I feel Bixby thinks he could use the unknown person (Victor) to help against The Mallers as it's a bit weird for them to be sneaking in to The Colony when it is in this situation unless they are chasing down the Mallers (Maybe he knows about the Tower people and The Mallers history?)