Bath began the second half on the front foot but were punished for turning the ball over when Short hacked on Farrell's punt upfield and Ratouvou touched down.
As both sides showed the signs of a sapping encounter, a hopeful punt was spilled by Marras full-back Craig Benson just short of the line, and a gleeful Stewart Sanderson took full advantage to collect the bobbling ball and fall over the line.