Also through are Welsh Wanderers, 13-3 winners against Sheffield Stingrays, and English Roses, who beat Rotherham Metro 10-5.
Otter and Wanderers are level at the top on nine points. The two sides meet in a potential title decider when the Championship 2 programme ends at Northampton on 2/3 March.
Photo (Trevor Hyde): Former GB goalkeeper Jenny Braddock (white cap) is better known as a goal-scorer these days! She contributed five in English Roses' 10-4 defeat of Penguin Emperors.