Yes he was asking for this. Wonder if Fex healing ability was enough to fight off the poison if so they might be able to get antibodies for it from him.
So just a simple walk for Quinn good on him and at least he didn't kill everyone but I have a feeling they may well just ask to join the Cursed Faction. I hope that Fex is able to keep himself under control until Quinn gets back with Mantis and that he and Quinn bleed Mantis dry afterwards