Nothing surprises me about TWD anymore. I knew that scene was coming eventually, but the fact that they lined up a bunch of the more marginalized characters like Tara or the consistently useless Enid just cracks me up and makes me sigh at the same time. It's become such a treadmill (like the comics) of shock, and I know they actually have a wonderful corps of very talented and diverse directors and I believe writers from way back, and such a great and talented cast - but at this point I can't bring myself to care. I'll watch the Rick + Michonne movies and catch up when they come out, but I have a difficult time investing in it post-Negan beyond a few of my favorite characters because even when many episodes are good, scripts, performances, you're always just waiting for the next Kirkman shock beat.
And yes - 'Brett Butler decapitated' is not a headline I expected tonight.
For the record, Tara, Enid etc. were not among the heads on pikes in the original storyline. (Tara was a minor character long dead by then IIRC and I don't think Enid even existed.) Rosita was one of the heads in the original story, but not here.