What was Ranveer Singh doing on the sets of Ajay Devgn and Rohit Shetty's 'Golmaal Again'?

What was Ranveer Singh doing on the sets of Ajay Devgn and Rohit Shetty's 'Golmaal Again'? Rohit Shetty has kickstarted working on the fourth instalment of his most entertaining franchise http://www.bollywoodbubble.com/news/what-was-ranveer-singh-doing-on-the-sets-of-ajay-devgn-and-rohit-shettys-golmaal-again/