https://reason.com/2024/01/26/the-most-horrible-thing-ive-ever-seen-alabama-executes-inmate-with-experimental-method/
"The state originally pushed back against Smith's request, arguing that they did not have proper facilities and procedures to kill Smith through the experimental method. But the Supreme Court disagreed, denying cert to the state's attempt to overturn an earlier ruling allowing Smith to choose execution by nitrogen hypoxia."
"In an apparent attempt to save his life, Smith's lawyers have pivoted in recent months to instead argue that nitrogen hypoxia would lead to a tortuous death for Smith and that the experimental nature of the execution meant that the state could not guarantee a smooth execution."
This is a really strange case. However, they still shouldn't have been engaging in this sort of torture (and it's questionable why they feel such urgency to put someone to death).