lodini said:Here's the part you are missing. The safety itself is a "legal shot"... but a ball that is pocketed during a safety is considered to be illegally pocketed.
4.16 ILLEGALLY POCKETED BALLS
An object ball is considered to be illegally pocketed when (1) that object ball is pocketed on the same shot a foul is committed, or (2) the called ball did not go in the designated pocket, or (3) a safety is called prior to the shot. Illegally pocketed balls remain pocketed and are scored in favor of the shooter controlling that specific group of balls, solids or stripes.
And in this case, no one controlled either group of balls yet... hence, still open.
Totally clear. So it's open.