E1vS

By the way Slay unhireable bug introduced recently. I remember I could hire him last time I played aprox. 1-2 weeks ago.

I traced the conversation now and found out that Slay will only offer the recruitment option if the player has the "Kill Terrorists" quest active. In your savegame this quest is already solved and therefore Slay's NPC record 1 will not trigger which in turn doesn't activate Fact 155 which means that you can't hire him. I have no idea how you managed to solve that quest without killing him however...