IT was a great move but it's because Rosberg got a bit sideways and lost a load of speed. Still lots of balls, particularly to do that against Rosberg of any driver.
Hamilton can't really save his tires now as Verstappen will just come right for him.
EDIT:- Lol, Verstappen passes Rosberg, Hamilton puts in fastest lap of the race as if to say "I have some competition now, better speed up".