ThirdWizard said:
The full attack action isn't over. Lets take a fighter 6 who has two attacks and TWF and is holding two swords. He takes his first attack and doesn't use the TWF rules. He has taken his first attack with no penalty. After that he can still complete his full attack by taking his second iterative attack. Can he attack with his off hand? No. Why? He didn't take the TWF penalty, so he can't. If he had taken the penalty, he could have taken the third attack. His full attack action must end there.
And I think that the above example also applies to a flurrying monk.
Lets take the monk flurrying. He takes his flurry attack. He has now limited himself during his full attack action.
Only in the sense that he hasn't applied any penalties for using TWF, or a natural secondary attack, or Rapid Shot, or what have you. There is no other limit. For a monk with natural weapons, he still has that option open, since they don't penalize primary attacks.
He is still in his full attack action when he has completed his final flurry attack, but he cannot choose to now use an attack limited by flurry of blows because that would invalidate the flurry that he has already performed. He is stuck with his decision and since he is unable to make any more attacks, his full attack action must end.
There is nothing to support this claim. The monk is still in his full attack action - only the flurry part has ended. Check out Table 3-10 in the PHB. The "Flurry of Blows Attack Bonus" column there indicates the attacks that are part of the flurry - any other attacks a monk may make that round are not part of the flurry, and thus not subject to its prohibitions on weapons (though the penalty applies, as always). You're making a distinction where none exists. Nothing says that a further attack "invalidates" the flurry, or that he can't make any other attacks.
In fact, you contradicted yourself above: "the flurry he has already performed", as you put it, means that the flurry is now over, which means that the prohibition on non-monk weapons is also over, so there's no reason he can't make off-hand or secondary attacks.
You cannot end your full attack action then decide to take another attack. That makes no sense whatsoever.
Had the full attack action ended, I would agree, but it hasn't so I don't.