The powder drops on the up stroke in stage two, so the primer has already been seated.
Stroke one - up : Resize
Index
Stroke one - down : seat primer
Stoke two - up : Bell, drop powder
Index
Stroke two - down : nothing
I'm somewhat ambivalent about the Pro 2000 auto-index announcment. It was the happiest day of my life when the auto-index part broke (due to me getting frustrated and jamming the handle down when it got stuck) on my auto 4x4 press. I removed all the auto-index pieces and manually indexed, and reliability soared.