By calling the battle at Kuru-kshetra a yagna, Krishna indicates that Arjuna is part of an exchange. Either he is the yajamana who will please his brothers, or he is the devata who has to repay the debt he owes his brothers. The Pandavas depend on him, and he is indebted to the Pandavas. To deny these dependencies, these expectations and obligations, is to deny humanity.
