Rosenborg's superior fitness began to tell as the half progressed and RoarStrand blazed wide before Blayney brilliantly tipped Henriksen's shot round the post for a corner.
Semb's problems could have been more severe as, despite earlier fears, he has been able to include the English-based trio of Eirik Bakke, Ole Gunnar Solskjaer and Vegard Heggem, as well as Rosenborg's RoarStrand.