"If it didn't work a first time, it certainly won't a second," the prisoner mutters with sufficient disdain to convince any possible listeners — all of none, in a place deserted — that this man here is the greatest fool to have graced the grounds, this life and the next.

He even turns around to be spared the indignity of watching this sight of failure (again) —

...only to flinch at the sound of metal hitting stone, when the dog unexpectedly... yields, shoving its great, bony head into the visitor's arm and seeking... pets.

Well, then. No time to calculate the odds of that ever occurring. Victory is won, however bizarrely.

"Bring that here. Let me out."