I spoke warily.
"That depends on the man--on the nice balance of his dual nature.

On the one side is the power to demand mercilessly; on the other, the instinct to respond.

Of course, the criminal--" "What are you dragging in criminals for ?" he said sharply.

"I'm talking about honourable men with consciences.

Criminals haven't consciences.
The devil who has just been hung for murdering three women in their baths hadn't any dual nature, as you call it.