"Thats why in some cases in that PDF, from Euthanasia clinics, some patients didn't die completely and were in a comatose state "
That is disturbing.
I downloaded the PPH of Oct 2018 - the latest edition available here (very slow download even tho I have a fast internet connection) and I've been reading about N there. There is a section in the how to use N chapter called "interaction with other drugs". It says NOTHING about benzos. Later it did say that you SHOULD use benzos if you are taking phenobarbitol (not to be confused with pentobarbitol aka N). Too bad I can't, or just don't know how, to cut and paste the excerpts here.