It is hard to “put down” such an evil, demon possessed servant of Satan, the “god of this world”.
They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
Mark 16:18
Sounds like he did two out of three.
That’s my hypothesis: demonic possession. He was so packed full of ‘em, so infested, they kept him going until well after he was biologically dead.
Oh, BTW: they say that a couple of days after Yusupov wrapped the Mad Monk’s corpse in weighted chains and threw him in the Neva, when his body was recovered, he was found to have squirmed out of, like, seven of the eight chains.
I’m just sayin’