Rishi just starts arguing the case...without once meeting Mandira or hearing her side of the story. Or any type of preparation. He only studied some papers...that too with Radhey (of all people!).
It comes to him as a surprise that Sameer and Mandira had a one-night stand. He should know everything about his client. This is too big an error. Indira is right. Quite a lot is at stake.