A320 Final mode engagement conditions

[simyoke]

I found another confusing explanation as to the Final mode engaement conditions for non precision approaches.

Please, refer to FCOM vol. 1 1.22.30 on page 55(the page number might differ)

To quote the paragraph that has the problematic sentence:

Enagement conditions

APP NAV and NAV modes engage under the same conditions:

If NAV mode was engaged, APP NAV engages immediately. If HDG/TRK is engaged, APP NAV engages when the intercept conditions are met( aircraft track line must intercept the flight plan active leg).

FINAL mode engages, if:
-APPR phsed is active, and the deceleration point has sequenced, and
-APP NAV is engaged, and
-Cross track error is less than 1.5NM, and
-FINAL is armed, and
-The aircraft intercepts a descending leg of the vertical flight path, or
-In V/S (FPA) or OPEN DES, the aircraft intercepts a level-off segment of the vertical flight profile, with an FCU-selected altitude different from this level-off segment

What I do not understand is the red part; I just can't think of a situation that righfully reflect the circumstance which the red part tries to depict.

The only way to intercept the level-off segment--wherever the level-off segment may be located--in V/S or OPEN DES would be to push in V/S, FPA selector, which will engage FINAL mode according to FCOM, I presume? I konw that this barely happens in real world but Any A320 jockeys please, help.