While prowling the ramparts of this year’s Summer Game Fest, I rode a zipline to a broken attic window and snuck into a sealed chamber containing Thick As Thieves, the unofficial multiplayer Thief game from Otherside Entertainment. Also in the sealed chamber: celebrated Looking Glass dude and Deus Exman Warren Spector, who walked us through a hands-off demo of the PvPvE heisting sim.