Prince Of Persia Revelation guide neoseeker

1 ) "Go through the shortcut door on your left, you
should now find yourself in the central hall. If this was your first tower,
then there will be a cutscene and after watching go to section 3.09. If this
is your second tower then continue normally."

There was a cutscene but I have been through section 3.09.

2 ) "Roll past a spinning blade and go up a flight of stairs..."... What does that mean? It doesn't make any sense... Please anyone help me.... I have been stuck a long time know....