बन्धुमुख्यप्रग्रहः प्रतिग्रहः ॥ कZ_०७.१७.११ ॥
bandhu-mukhya-pragrahaḥ pratigrahaḥ
Una «prenda recíproca» (pratigraha) es la toma/retención (pragraha) de un pariente o de un hombre principal (dirigente).
It creates enforceable reciprocity: by holding a high-value person, the state gains leverage to deter breach and to compel performance without immediate war.