Just as in a battle between a boar and a dog, the huntsman is the party to forfeit when either is slain, so, I think, O intelligent one, Vasudeva's son is to be party benefitted in that battle between Karna and Hidimva's son.
स्तयोरभावे श्वपचस्य लाभ:। मन्ये विद्वन् वासुदेवस्य तद्वद् युद्धे लाभः कर्णहैडिम्बयोवै॥