asume you have a 2-patch spi.
Run the line through the first patch, put a stopperball a ft before end of line, fix the line to the 2nd patch. Make sure the stopperball protects the patches to meet together in a big mess before snuffing. Goal is to start snuffing with the 1 patch first and then with the 2nd patch a bit later. sorry for my bad english
greetings from germany