Drona has performed a difficult feat for he fights with Arjuna, of great energy, firmhanded, irrepressible and an afflicter of foes.
दुष्करं कृतवान् द्रोणो यदर्जुनमयोधयत्॥ प्रमाथिनं महावीर्यं दृढमुष्टिं दुरासदम्।