Shloka 36
रात्रौ युद्धप्रवृत्तिः — Night Battle Begins; Duryodhana’s Protective Orders for Droṇa
Droṇa-parva 139
संजय उवाच तान् निहत्य महाबाहू राधेयस्यैव पश्यतः । सिंहनादरवं घोरमसृजत् पाण्डुनन्दन:,संजय कहते हैं--राजन्! राधानन्दन कर्णके देखते-देखते उन सातों भाइयोंको मारकर पाण्डुनन्दन महाबाहु भीमने भयंकर सिंहनाद किया
sañjaya uvāca tān nihatyā mahābāhū rādheyasyaiva paśyataḥ | siṃhanāda-ravaṃ ghoraṃ asṛjat pāṇḍu-nandanaḥ ||
सञ्जय उवाच—तान् निहत्य महाबाहुः राधेयस्यैव पश्यतः। पाण्डुनन्दनभीमः सिंहनादरवं घोरमसृजत्॥
संजय उवाच
Educational Q&A
In the battlefield ethic of the Mahabharata, valor is not only physical but also psychological: a warrior’s siṃhanāda (lion-roar) functions as a declaration of fearlessness and a deliberate challenge meant to unsettle the opponent—here, directed pointedly at Karna as witness.
Bhima has just slain a group of foes (referred to as 'them') while Karna watches. Immediately afterward, Bhima roars like a lion—an emphatic signal of victory and intimidation amid the ongoing fighting in the Drona Parva.