FTR I’m generally against the death penalty, so same, don’t give me grief. I’m of the opinion that if it’s gonna be done, don’t fuck it up.
Ok. So regarding the implementation it sounds like they fucked it up. As you said (and I previously implied) it sounds like they didn’t properly exclude oxygen/remove waste CO2. Kinda hard to believe they fucked up something so simple considering the ton of evidence on hypoxic accidents.