What is the significance of Duryodhana's saying dhīmatā, tava śiṣyeṇa? (1.3 Lecture)

Drona because he was a good brahmana, accepted even his enemy as his student. This student now stands before him arranging the army of Drona's enemy. Duryodhana wanted to point out at Drona that this is a mistake and that he may be uncompromising in the fighting. Also when meeting the pandavas in battle, especially Arjuna, may Drona be uncompromising as well since he is his very intelligent disciple.(tava—your; śiṣyeṇa—disciple; dhīmatā—very intelligent.)