Spring mvc: One step view or Two Step View?

I am reading famous Fauler's book "Enterprise application patterns" And I can't understand difference between One step view(top part) and Two Step View(bottom part)

I read all text but I understood only one thing

In case of two step view I have 1 additional intermediate logical view. It is really not clear for me why do I need it. In my practice I use spring - mvc for web application. Could you explain which pattern is used inside this framework? Could I choose it ?