Dhananjaya, the son of Kunti, not liking to slay his preceptor (i.e. Kripa) and his (other) preceptor's son (i.e. Ashvatthama) in battle began to act like a preceptor (teaching the science of arms of his pupil).
सोऽजिघांसुर्मुरं संख्ये गुरोस्तनयमवे च। चकाराचार्यकं तत्र कुन्तीपुत्रो धनंजयः॥