Bhishma schools Karna. The old man clearly had a measure of the man https://www.sacred-texts.com/hin/m05/m05169.htm">https://www.sacred-texts.com/hin/m05/m... https://twitter.com/pranasutra/status/1247928805529804801">https://twitter.com/pranasutr...
Karna& #39;s ego is bruised and he retreats to his tent, sulking for ten days and does not return until Bhishma is dead. Absolute irresponsibility. If he had so much gratitude towards Duryodhana, it is a small man who would let his ego get the better of his duty.