The Lord is the absolute form of eternity, bliss and knowledge. As such, transcendental loving service to the Lord in one of the five principal relations, namely śānta, dāsya, sakhya, vātsalya and mādhurya, i.e., neutrality, servitorship, fraternity, filial affection and conjugal love, is graciously accepted by the Lord when offered to the Lord in genuine love and affection. Śrī Bhīṣmadeva is a great devotee of the Lord in the relation of servitorship. Thus his throwing of sharp arrows at the transcendental body of the Lord is as good as the worship of another devotee who throws soft roses upon Him.
It appears that Bhīṣmadeva is repenting the actions he committed against the person of the Lord. But factually the Lord's body was not at all pained, due to His transcendental existence. His body is not matter. Both He Himself and His body are complete spiritual identity. Spirit is never pierced, burnt, dried, moistened, etc. This is vividly explained in the Bhagavad-gītā. So also it is stated in the Skanda Purāṇa. It is said there that spirit is always uncontaminated and indestructible. It cannot be distressed, nor can it be dried up. When Lord Viṣṇu in His incarnation appears before us, He seems to be like one of the conditioned souls, materially encaged, just to bewilder the asuras, or the nonbelievers, who are always alert to kill the Lord, even from the very beginning of His appearance. Kaṁsa wanted to kill Kṛṣṇa, and Rāvaṇa wanted to kill Rāma, because foolishly they were unaware of the fact that the Lord is never killed, for the spirit is never annihilated.
Therefore Bhīṣmadeva's piercing of the body of Lord Kṛṣṇa is a sort of bewildering problem for the nondevotee atheist, but those who are devotees, or liberated souls, are not bewildered.
Bhīṣmadeva appreciated the all-merciful attitude of the Lord because He did not leave Arjuna alone, although He was disturbed by the sharpened arrows of Bhīṣmadeva, nor was He reluctant to come before Bhīṣma's deathbed, even though He was ill-treated by him on the battlefield. Bhīṣma's repentance and the Lord's merciful attitude are both unique in this picture.
Śrī Viśvanātha Cakravartī Ṭhākura, a great ācārya and devotee in the humor of conjugal love with the Lord, remarks very saliently in this regard. He says that the wounds created on the body of the Lord by the sharpened arrows of Bhīṣmadeva were as pleasing to the Lord as the biting of a fiancee who bites the body of the Lord directed by a strong sense of sex desire. Such biting by the opposite sex is never taken as a sign of enmity, even if there is a wound on the body. Therefore, the fighting as an exchange of transcendental pleasure between the Lord and His pure devotee, Śrī Bhīṣmadeva, was not at all mundane. Besides that, since the Lord's body and the Lord are identical, there was no possibility of wounds in the absolute body. The apparent wounds caused by the sharpened arrows are misleading to the common man, but one who has a little absolute knowledge can understand the transcendental exchange in the chivalrous relation. The Lord was perfectly happy with the wounds caused by the sharpened arrows of Bhīṣmadeva. The word vibhidyamāna is significant because the Lord's skin is not different from the Lord. Because our skin is different from our soul, in our case the word vibhidyamāna, or being bruised and cut, would have been quite suitable. Transcendental bliss is of different varieties, and the variety of activities in the mundane world is but a perverted reflection of transcendental bliss. Because everything in the mundane world is qualitatively mundane, it is full of inebrieties, whereas in the absolute realm, because everything is of the same absolute nature, there are varieties of enjoyment without inebriety. The Lord enjoyed the wounds created by His great devotee Bhīṣmadeva, and because Bhīṣmadeva is a devotee in the chivalrous relation, he fixes up his mind on Kṛṣṇa in that wounded condition.