You should not think of it. It was not Drona's son that performed that act. It was done through the power of Mahadeva. Do now what should be done next."
न तन्मनसि कर्तव्यं न च तद् द्रौणिना कृतम्। महादेवप्रसादेन कुरु कार्यमनन्तरम्॥