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…The dealings of Lord Kṛṣṇa and Bhīṣmadeva on the Battlefield of Kurukṣetra are interesting because the activities of Lord Śrī Kṛṣṇa appeared to be partial to Arjuna and at enmity with Bhīṣmadeva; but factually all this was especially meant to show special favor to Bhīṣmadeva, a great devotee of the Lord. The astounding feature of such dealings is that a devotee can please the Lord by playing the part of an enemy.
Srimad Bhagavatam
By His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
First Canto, Chapter 9, Text 38
The Passing Away of Bhismadeva