Point 2 is REFRESH.
Refresh means: to get data from source (the other DB that originated your virtual copy)
Rewind means: to get old data from the history of your VDB
Let's have a source DB called DB_1
DB_1 -> generates a virtual copy VDB_1
refreshing VDB_1: copy data from DB_1 to VDB_1
rewinding VDB_1: copy data from the past of the VDB_1 to VDB_1 (is like the rewind on your old music tape).
Hope my sample will be useful.
Regards.
Gianpiero