Northampton gave themselves a glimmer of hope before half-time when Chris Mayor flicked the ball on one-handed for Diggen to cross in the left-hand corner.
There strokes so incapacitated him that he had sometimes to write left-handed and sometimes to grasp his half-paralysed right wrist in his left handin completing his Ninth Symphony, which opened amidst jubilation in Moscow this summer.
It was the cue for the Robins to move up a gear as Galea's sharp switch in direction and hand-off got them off the mark on seven minutes and handed Dobson an easy conversion.