Indeed that vilest of wretches viz., your uterine brother Sikhandin, was the cause of Bhisma's death. Really there is no one more sinful on the face of the earth, than the sons of Panchala king
तस्यापि तव सोदर्यो निहन्ता पापकृत्तमः॥ नान्यः पाञ्चाल्यपुत्रेभ्यो विद्यते भुवि पापकृत्।