"No, Tris." Tobias shook his head. "The last thing I remember we were stopping the simulation that was making the Dauntless attack Abnegation." There was a whole lot more to it, sure, but that was the gist of it. "We stopped it, but Tris. It wasn't a memory serum." He frowned. No, it was a simulation that turned all the Dauntless into killing machines, attacking the Abnegation faction with guns and subdued minds.