व्रजन्ति ते मूढधियः पराभवं
भवन्ति मायाविषु येन मायिनः |
प्रविश्य हि घ्नंति शठास्तथाविधान्
असंवृताङ्गान् निशिता इवेषवः ||
If person does not deal with a crook in crooked manner, he is bound to face defeat. They must be paid back in their own coin. Just like how an arrow most certainly hits (and hurts) that part of the body (how ever small) that is not covered by the armor, such deceitful people search and hurt only those people who are innocent and incapable of deceit themselves.