At that time Bhishma was not born not even a Kshatriya like myself, energetic beings were created afterwards, you consumed only straw.
न तदा जातवान् भीष्मः क्षत्रियो वापि मद्विधः। पश्चाज्जातानि तेजांसि तृणेषु ज्वलितं त्वया।॥