I wouldn't blink if I were in a situation of "this guy has information that will save ANYONE's life and I was the only one able to act".
I'd grab a few tools from my tool box and he'd either tell, or spend the rest of his life a miserable wreck.
I'd start with a hammer, ballpeen type. Work on those fingers. That fails, I'd take a lamp, cut the cord and split the wires, then plug in the end... and brush him gently a few times.
Failing that.. I'd get a spoon, and feed him an eyeball.
Maybe his nuts as well.
And I wouldn't feel guilty about it. AT ALL.