The Lord assured them of help, and told them about the Krishna avatara, which He was going to take. What the sloka indicates is that two kinds of light emanated from Lord Narayana. One was a white light. The white light took the avatara of Balarama and the blue light took the avatara of Krishna. A similar interpretation of the word ‘kesa’ is offered by Sankara Bhagavadpada, in his interpretation of a Vedic mantra.

Source: The Hindu May 09, 2021 16:09 UTC