Hunted shot / Twin takedown / Flurry of blows while Hidden (Hide action)

[Nikyou]

Hunted shot, Twin takedown and Flurry of blows basically work the same: 2 attacks for 1 action and damage is combined for the purpose of resistances and weaknesses.
While you are hidden, target is flat-footed for the first attack: "If you attempt to Strike a creature, the creature remains flatfooted against that attack, and you then become observed."
The question is: Does flat-footed condition apply to both attacks or just the first one?

[Slamy Mcbiteo]

Well hidden says "Strike" and "attack"....not Action. So I would think only the first attack in the set. but that is my interpretation of the wording