Despite their complaints and refusals and their beliefs, Fitz and Jemma and Skye have all learned things from Ward and are applying it. They don’t want to turn into Ward, not anymore, but they are and they’re not acknowleding it.
Fitz tortures him, removes his oxygen, and then tells Coulson that he’s “not a killer” - but he has, in fact, shot and killed a man. It was self-defense, but he has killed a man. Meanwhile, he tortures a man who perhaps deserves it, but is still helpless in that moment - doesn’t kill him, but maybe that’s worse. Ward? Shot a man in cold blood because he threatened someone he cared about.
Jemma has learned to lie. She has learned to pick the right truths to mask her nervousness and her tells, to prepare herself for the very few lies that she must tell. She has learned to spin the truth in a way that benefits her, to share her life under her rules, and she has successfully remained undercover. Ward? Tells the team the truth about his abusive history in order to gain their trust.
Skye has killed now. She has shot someone before Hydra could, pulled that trigger, because she had to. She made the hard the call, the right call, because she needed to. And Ward? Well. We know he’s killed plenty of people because he believed he had to.
They’re picking up things from Ward. It’s not necessarily a bad thing, given the circumstances and their situations. Fitz is frustrated at himself, Jemma is guilty and needs a distraction, Skye is trying to compartmentalize while she yearns for what was. And meanwhile, they’re all turning into what they hate.
Someone better acknowledge that before it’s too late, though.