The scene being shot demanded Imran to have a gun in one hand and Katrina by his side. He was to move around and pull Katrina towards him with the other hand. An error in judgement led to Imran smashing the barrel of his gun into Kat's nose. It happened so quickly and in seconds Kat's nose was bleeding. Coincidentally, this was the same side of Kat's nose that was injured during the shoot of 'Ajab Prem Ki Gajab Kahani' when Ranbir accidentally landed a blow on her face. 

Seeing the state of her nose everyone panicked, the shooting was cancelled and Katrina was escorted to her van. A doctor was called and she was administered first aid. The bleeding did stop but she was still in pain. Twice hit in the same spot, Katrina should really get her nose insured.
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