'Chhotu idhar mat maar yaar' - What made Shastri say that to Pant?

Ravichandran Ashwin happened to overhear some of the conversation former India coach Ravi Shastri had with Rishabh Pant during a Test match against Englandi n Chennai, but the veteran off-spinner got a chance to pick Shastri's brain only years later in the latest episode of his show on his YouTube channel.