You might be thinking of a try in the 1980 Premiership Final against Bradford N at Station Rd, Swinton. Keith Bentley ended up scoring the try but it was created by Aspey's break from his own line followed by a pin-point kick through from about the half-way line. When interviewed after the game, Mal said something along the lines of "Well I had to kick it really since I couldn't have run much further myself". He may or may not have had his tongue in his cheek

I think that has to be one of the best dummies I have ever seen. Look at the reaction of the two Bradford defenders who both went for Bentley and then the way Mal kicked the ball with perfect weight and distance as he was being tackled. A great try. Look at it from 28 seconds in Widnes Montage 1 on YouTube.