Bhagavad Gita Chapter 1, Verse 3

पश्यैतां पाण्डुपुत्राणामाचार्य महतीं चमूम् | व्यूढां द्रुपदपुत्रेण तव शिष्येण धीमता ||

paśyaitāṁ pāṇḍu-putrāṇām ācārya mahatīṁ camūm vyūḍhāṁ drupada-putreṇa tava śiṣyeṇa dhīmatā

O Acharya, please see this mighty army of the Pandavas, arranged in formation by your own intelligent disciple, the son of Drupada.

Duryodhana begins by drawing Drona's attention to the Pandava army — pointing out that it has been arranged by Dhrishtadyumna, Drona's own student. This is not a simple observation; it is a calculated remark. He is reminding Drona that the enemy's strategy was shaped by someone Drona himself trained, quietly raising questions about loyalty and stirring up guilt. This is the psychology of an insecure mind: when a person feels threatened, they use guilt to make others feel responsible for the difficulties they are facing.