Mbh 7.201.1a

“Sanjaya said, ‘Beholding Bhimasena overwhelmed by that weapon, Dhananjaya, for baffling its energy, covered him with the Varuna weapon. In consequence of the lightness of Arjuna’s arms, and owing also to the fiery force that shrouded Bhima, none could see that the latter had been covered with the Varuna weapon. Shrouded with the weapon of Drona’s son, Bhima, his steeds, driver, and car became incapable of being gazed at, like a fire of blazing flame in the midst of another fire. As at the close of the night, O king, all the luminaries run towards the Asta hill, even so the fiery shafts (of Aswatthaman) all began to proceed towards Bhimasena’s car. Indeed, Bhima himself, his car, steeds, and driver, O sire, thus shrouded by Drona’s son seemed to be in the midst of a conflagration. As the (Yuga) fire consuming the entire universe with its mobile and immobile creatures when the hour of dissolution comes, at last enters the mouth of the Creator, even so as the weapon of Drona’s son began to enter the body of Bhimasena. As one cannot perceive a fire if it penetrates into the sun or the sun if it enters into a fire, even so none could perceive that energy which penetrated into Bhima’s body. Beholding that weapon thus investing Bhima all around, and seeing Drona’s son swelling with energy and might, the latter being then without an antagonist, and observing also that all the warriors of the Pandava army had laid down their weapons and that all the mighty car-warriors of that host headed by Yudhishthira had turned away their faces from the foe, those two heroes, viz., Arjuna and Vasudeva, both endued with great splendour, quickly alighting from their car, ran towards Bhima. Those two mighty men, diving into that energy born of the might of Aswatthaman’s weapon, had resorted to the power of illusion.