But the Railwaymen had no shortage of opportunities to get back into the contest.
Thordarson said: "I felt we had chances we should have taken. Even at the end when my right winger put the ball over the bar it was a good chance. There were chances flying across the goalmouth in the first half which we should have made more of.
"That frustrates me but the positive sign is we are creating chances. I always thought we were going to score a goal but in the end it didn't happen and if you don't score you don't win.
"It is a difficult defeat to accept because it gives space between the two teams and it will be difficult for us to catch up. But it is not over yet and there is a long way to go."