I guess I shouldn't have said "spin rinse"
Yes it retains the water as the clothes are spinning around 100 rpm, but it does this while filling for long enough that you can hear rinse water really sloshing hard through the clothes. I almost always use extra rinse (for 3 rinses), and each rinse takes less time off the slow spin as it fills. The first rinse is the longest, followed by the second second being a little shorter, then the third rinse the shortest