"It's blazing hot" said a spokes person. A source close to the unit said that, "Irrfan has been shooting continuously in the hot sun under soaring temperatures."
While shooting for a scene Irrfan felt very uneasy and had a blackout, he got dehydrated and to his luck it wasn't very serious.
It was just too much of heat and too much of work which caused this dehydration adds another source. Now Irrfan is fine and is continuing his shooting schedule.