Why Bollywood villain Shakaal is happy with Mumbai monsoon

Bollwood villain Shakaal, who was last seen in 1980 when he used to chill with Amitabh Bachchan and Shatrugan Sinha, is very happy with the Mumbai monsoons. But why? How does he gain from it? A news anchor tries to find out, but all of it results in a chilling end to the whole event.