It's Tess. She's been skewered by one of the arrows. Oliver goes to her, cradling her head in the crook of his elbow. "You always were a good shot," she says shakily, tears streaming down her face. He rocks her gently and says didn't do this to her. "I know I did this to myself," she says. She knows choosing to side with Zod was a risk, but she thought she was saving the Earth. How does siding with a genocidal maniac save the Earth? How? Explain, show! Oliver caresses her cheek as she gives one last sigh and goes limp in his arms. He cries a little and kisses her forehead. Good acting all around, marred only by the flimsy character motivations leading up to this moment. Oliver slowly becomes aware that someone is standing behind up. He looks up at Chloe. "I had the shot," she says coldly. "I had to take it." She walks away, leaving him still rocking Tess's rapidly cooling corpse.
The next shot is of Tess's face, eyes closed, and tastefully made up. As the camera pulls back, we see that she's lying in a shallow grave. While Lois watches, Oliver drops a big shovelful of dirt right on Tess's face. It's quite a shocking thing to see, and shocking to Tess, too, apparently, because she awakes with a start in the present day. She starts yanking the sensors out of her temples with pained grunts. "Chloe kills me," she says. Stuart helpfully reminds her she's still alive. Tess, speaking in a panicked, sobbing jumble, orders him to use the equipment to wipe Lois's memory of the future because it's too dangerous for Lois to know the things that Tess just saw. Stuart protests because Lois could end up catatonic. "Don't argue with me, Stuart." She gives him the death-eyes again and he takes a few stilted steps toward the computer. He sighs and thinks and sighs some more. Finally, he says he won't do it. Tess can't quite believe what she's hearing. Next time when you hire an evil minion, make sure they're actually evil. He turns back to the computer to end the procedure. Tess shoots him in the back of the head and he drops to the floor. She goes to wipe Lois's memory herself but Clark's whooshing into the room interrupts her. He immediately starts feeling woozy because of all the kryptonite. Tess tries to cover her ass by blaming everything on Stuart. Clark shoves her into a metal cart and knocks her unconscious. Clark pulls one of the sensor prongs out of Lois's temple and accidentally jabs himself in the hand. I guess Kryptonian brains are located not in their skulls but in their hands, because Clark immediately starts seeing Lois's visions.