Spatal Surge Aftercast
It probably does, but clones simply attack on a slower cycle. It’s not the aftercast slowing them down, it’s more of a cooldown.
I’ll have to log in and check out the attack speed of the other clones (excluding scepter). The greatsword clones seemed as though their attack speed wasn’t changed at all, which is glaringly slow. I have a hard time believing that’s intentional.