My bad that this is nearly two years late!
You have to remember that in 3.5 they allowed for a prestige class called Invisible Blade, that eventually allow for free action feints that would leave your opponent invulnerable for any attack for the entire round.
A shame that they tried to do the same but depended on a party to complete the task compare to a single individual. That was the whole purpose of the Invisible Blade. As long as they were armed with a dagger type weapon and no armor, they could sucker an enemy into being flat-flooted and sneak attacked with every attack afterwards.
