In an interview to Empire magazine, the 26-year-old star says his part in the film required a different kind of energy for which he went through a lot of things.
"It required an energy shift. I'm a super-hyperactive kind of dude and the role required a level of stillness. Saroo had this emotional pain, this weight. I spent eight months prepping and it was all a process of introspection.
"I travelled around India on trains to get a feel of what it would be like, I wrote diaries, I visited orphanages. Garth (Davis) would get me to stare in the mirror for an hour. It's amazing what you can see when you stop for a moment and really try to look inside yourself," he said.
"At the end of it, Garth said, 'Before you go, I'm wondering if you could just scream?' I was like, 'What do you mean?' He said, 'I want you to roar like a lion. Let go of emotion and completely purge the pain you'd feel in Saroo's situation. You don't have to do it.'
"And I was like, 'Of course I have to'. So I did and I completely lost my mind. I was jumping in at the deep end," he said.
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