At that time, Guruji didn’t know Dilbag will be killed by Batya and Malcolm-they do so to eliminate the very idea of fail-safe. So if Guruji wanted to make his plan fail-safe, he’d (hide) the passcode (which would disable the bomb) on the page that has Dilbag’s handprints in his book. Grover in an interview to Huffington Post said that “When Dilbag was putting his hands in Guruji’s book, he was the only one who had a doubt about Guruji’s plan of destruction.
