@Berlin76 He was administered Secobarbital, not Pentobarbital. Back in the 2000s, they would use both in that state (that year in 2005, 89% N exits vs 11% Seconal)
But yeah exactly ! The scenario you described is the most likely. Let's stick to that explanation.
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The remark you made about the advantage of having a supervised euthanasia rather than be on your own, unassisted, is also pretty spot on.
You're in good hands now ! Don't feel too disappointed if you're not welcomed by a divinity ;) (I personally believe in a blurry form of afterlife, but don't quote me on that lol)