Cruel and despicable, even for a Pitt Raider, Mex has been removed from general guard duties by Ashur and sent to guard the gates to Pitt Downtown after bouts of Pitt slave punishment that left many with horrific injuries. Adept with a rifle, Mex is content with tagging escapees, laying down a variety of mines, and watching his prey explode in a variety of impressive arterial spray patterns.
If you tell him you're a returning escaped slave, he will take all the items in your inventory (except the "hidden weapon" you may have received from Wernher), give you a slave outfit which is automatically equipped (whether you're wearing one already or not), and then tell you to enter Downtown.
If you tell him you came looking for work, he'll sarcastically invite you to enter through the door to Downtown and fill out a "fucking application", whereupon you are ambushed by Reddup and his men and all your items are taken (except the "hidden weapon" you may have received from Wernher), and you are issued a slave outfit which is automatically equipped.
If you kill him on the way in, you will also be ambushed, with the same result as if you were trying to "apply for a job" (but with different dialogue from the ambushers).
"HAHA! I love it. Another slave wandered back here, huh? You couldn't even get over the bridge, could you? You're lucky I don't fuckin' paste you. And look at all this! Where'd you get all this shit anyway? Whatever. Mine now. I hit the fuckin' jackpot today! Now get back in there and get to work, or next time I'll just stake you out there for the Trogs. (Posing as an escaped slave)"
"Is that so? Well, since we're hirin', you can just head right on in and fill out a fuckin' application. I'll let 'em know that you're comin'. They'll take good care of you once you get inside. (Joining the raiders)"