The recent signature of St. Patrick’s athletics ended from close just before the time sign, becoming the youth goalkeeper of the race after the hosts lost possession in their own box.
Earlier Nunan was involved when Mord was sent at the end of the first half, with Valdemar Lund showing a straight red card to deal with the teenager.
Rovers, the first Ireland League Club to reach the knockout stages of a major European competition, will now look to seal a place in the last 16, when the countries meet again in the returning leg of Talagt Stadium next Thursday.
Equality winners will face Cercle Bruge or Legia Warsaw in the next round.
After Caji’s opening to the race, Molde began to threaten Isaac Amundsen, who sends acrobatic experience beyond target, and the shot of Christian Eriksen, who brought rescue from Edward McGinti.
Then Rovers began to exert some pressure, and after Danny Mandroyu saw a low, diverted stroke gathered by Jacob Carlstrom, a further attack on the hoops caused the Norwegians to go down to 10 men in the 42nd minute.
Nonan was played, and Lund removed the young man with a sliding challenge, prompted Latvian referee Andris Traimanis to remove the red card.
Moments later Rovers was presented with a chance as Dylan Watts knocked down a free kick, but Roberto Lopez could only cause the ball.
As the country of Stephen Bradley continued to press at the beginning of the second half, Matt Hillie climbed wide outside.
And shortly after they were preceded, when Mats Moler Dylie was released in the Molde area of Watts and his cross was stabbed by Nunan.
A little in the way of clear chances were carved afterwards as Rovers replaced Aaron Green, hit the door at home late, turning the ball around the publication.