Shatter Defenses Timing

[ThorGN]

Does Shatter Defenses trigger for subsequent attacks if it was your first attack and caused the Shaken condition? (Through Enforcer or Cornugon Smash for example) Or do you need to hit them a second time before they are flat-footed for subsequent attacks?

Shatter Defenses (Combat)
Your skill with your chosen weapon leaves opponents unable to defend themselves if you strike them when their defenses are already compromised.
Prerequisites: Weapon Focus, Dazzling Display, base attack bonus +6, proficiency with weapon.
Benefit: Any shaken, frightened, or panicked opponent hit by you this round is flat-footed to your attacks until the end of your next turn. This includes any additional attacks you make this round.

[prototype00]

Edit: Actually, I don't know. Sorry to pretend to knowledge I thought I had.

prototype00

[cnetarian]

The consensus on the boards is that the later way is correct - 1st hit on shaken &c opponent sets up shatter defenses and attacks AFTER that one are treated as flat-footed. note that as long as the shaken/frightened/panicked condition lasts and you hit at least once per round the flat-footed condition would be constantly up after the 1st attack.