Hiranyakasipu had received from Lord Brahma the benediction that he would not die on the land or in the sky. Therefore, to keep the promise of Lord Brahma intact, Nrsimhadeva placed Hiranyakasipus body on His lap, which was neither land nor sky. Hiranyakasipu had received the benediction that he would not die either during the day or at night. Therefore, to keep this promise of Brahma, the Lord killed Hiranyakasipu in the evening, which is the end of day and the beginning of night but is neither day nor night. Hiranyakasipu had taken a benediction from Lord Brahma that he would not die from any weapon or be killed by any person, dead or alive. Therefore, just to keep the word of Lord Brahma, Lord Nrsimhadeva pierced Hiranyakasipus body with His nails, which were not weapons and were neither living nor dead. Indeed, the nails can be called dead, but at the same time they can be said to be alive. To keep intact all of Lord Brahmas benedictions, Lord Nrsimhadeva paradoxically but very easily killed the great demon Hiranyakasipu.