Mahabharata 5.176.12

भीष्मः पुरुषमानी च जितकाशी तथैव चतस्मात्प्रतिक्रिया युक्ता भीष्मे कारयितुं त्वया

bhīṣmaḥ puruṣamānī ca jitakāśī tathaiva catasmātpratikriyā yuktā bhīṣme kārayituṃ tvayā

Our plain-language meaning of this verse is waiting for scholar review.