Payne did clear up a couple of things that were not readily apparent in the episode. He said the Saviors were able to do what they did by caputuring the Hilltop guards (who don’t have guns) and tying them up. That scene was shot but the editors didn’t like it after the fact. (“It looked like a barbershop quartet all strung up,” he said.) The Saviors also locked all the residents inside their homes to make it more difficult for them to deal with the walkers. Plus, most of the Hilltop residents are not trained to fight. So Simon, the Savior leader/Negan understudy, was genuinely surprised when he came back the next day and found everyone alive and well and the walkers all gone and cleared out