The 68-year-old star is working with Prakash for the first time in "Aarakshan" and he saw the filmmaker shooting on the edge of a bridge without support and on a crane 50 feet above the ground just to get the perfect shot.
But this daredevil attitude did get Prakash into trouble twice during shooting.
Firstly, while taking a shot under the bulldozer, the driver didn't hear the "stop" and almost ran over him and second time he had an accident on a scooter.
This didn't dampen the spirits of the filmmaker who jokingly told his crew: "You've made me fall, but don't think I have fallen from grace."
"Aarakshan" is based on the controversial policies of caste-based reservations in government jobs and educational institutions. Apart from Amitabh, it features Saif Ali Khan, Deepika Padukone, Manoj Bajpayee and Prateik Babbar.
The film will hit theatres Aug 12.