As soon as you ascertain that you’ve indeed found your target's true failing, exploit it quickly and with precision. Turn their weakness into their downfall. I assure you, there is nothing more devastating to a man than being vanquished by his own mistakes.
And this is how you deal with your enemies. Still, as my father used to say, everyone has a weakness. It’s a fact of life. So now you must ask yourself: ‘What is mine?’