Lahiri was tied 33rd at six under while Frenchman Alexander Levy added a eight under to his first round nine under to move to an incredible 17 under as the event was reduced to 54 holes.
India's other player SSP Chawrasia crashed out with rounds of 69 and 75.
Fog had caused nearly seven hours of loss on day one and two and a further three-hour suspension today saw organisers take the decision to cut the tournament to 54 holes.
Englishman Ross Fisher made a birdie in his remaining three holes to reduce the overnight lead to five shots, but Levy was in a commanding position to claim his third European Tour.
Should he lift the trophy tomorrow afternoon, it will be the second time the 26-year-old has won a reduced event, with the Portugal Masters in 2014 being played over 36 holes due to heavy rain.
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