After three periods, Lancaster led 9-8, an advantage instantly overturned as Callum Bailey converted a penalty and Jack Waller added another goal. Curwen made it 10-10 before Invicta edged ahead again through Bailey. It needed a man-up opportunity for Curwen to rescue a point for Lancaster with his fourth goal of a thriller.
Title-chasing Manchester beat Sheffield 12-8 to complete their Division 1 programme with a perfect record from seven games.
Caledonia looked set for a first win when they began the last period against Bristol with a 9-6 lead. But Bristol were having none of it, flooring the Scots with seven goals to win 13-11.