Duryodhana who is strong in the beginning only and who is accustomed to every sort of indulgence thinks that he does well (increasing their energy). The boy thinks too that he is capable of robbing the living son of Pandu, of their share.
उत्थानवीर्यः सुखमेधमानो दुर्योधनः सुकृतं मन्यते तत्। तेषां भागं यच्च मन्येत बाल: शक्यं हर्तुं जीवतां पाण्डवानाम्॥