Absolutely horrific.
At this point it's trite to say that if this had happened in any other country, there would be incessant media outcry about it. That goes without saying. What I think is interesting is the nature of these experimental execution methods (god what an awful phrase). Who are they for? What is the purpose of this?
We can clearly see that it's not to make it painless for the inmate. It's also not to make it more efficient and quick, the guy choked and thrashed around for ten minutes. So what is the point of even experimenting with ways to kill a person? Is it merely supposed to be bloodless, to make cleaning up easier after the fact? A firing squad is quicker and relatively painless, because the person dies in a couple of seconds, rather than minutes, but it does make a mess.
I just don't get it. If that person should die, then why go through all this fucking trouble when you can just shoot them, or alternatively shoot them up with enough fentanyl to kill a horse? Bullets and fentanyl are cheap. Cheaper than nitrogen gas, I presume. Sometimes it feels like the sadistic fucks in charge of this theater (and it is a theater, curtains and all) are just trying some new shit to see what it will do. Experimenting for its own sake.