MUMBAI, March 29 -- The Anti-Extortion Cell of Mumbai police's crime branch, which is interrogating gangster Prasad Pujari alias Subhash Vitthal, in several cases, including murder, learnt that the 44-year-old henchman of the Chhota Rajan gang had visited Hong Kong to meet his mentor, gangster Kumar Pillai, and later in 2005, on Pillai's advice, he shifted to the special administrative region of China on a student visa - to study Chinese language and mass communication....