Landing lag
From Dissidia Wiki
When an airborne character reaches ground, they will enter a transitional state during which they are unable to perform any actions that do not involve EX or Assist. This is commonly referred to as "landing lag" and is the basis for landing hits against characters with relatively safe air dodges as well as setting up solo combos, such as Squall's Thunder Barret into Blasting Zone.
Landing lag lasts for 16 frames.