At what range can you feint?

[ohako]

Core Rulebook wrote:

Feint: Feinting is a standard action. To feint, make a Bluff skill check. The DC of this check is equal to 10 + your opponent's base attack bonus + your opponent's Wisdom modifier. If your opponent is trained in Sense Motive, the DC is instead equal to 10 + your opponent's Sense Motive bonus, if higher. If successful, the next melee attack you make against the target does not allow him to use his Dexterity bonus to AC (if any). This attack must be made on or before your next turn.

Adventurer's Guide wrote:

Diva Style: While using this style, you can use any Perform skill in place of Bluff to feint in combat. You can attempt a Perform check to feint as a move action when you begin a bardic performance.

Adventurer's Guide wrote:

Diva Advance: While using Diva Style, you do not provoke attacks of opportunity from creatures you have successfully feinted against. Additionally, you can feint against a creature using Diva Style from up to 30 feet away.

The rules for feinting don't say you have to threaten or be adjacent to your target, nor is there anything about the range of 'perform feinting' Diva Style.

At what range can you normally feint?

[Fuzzy-Wuzzy]

Well, feinting with a sword and no special abilities from 30' away would clearly be bogus; the foe has no reason to think you might possibly hit them, so they're not going to react no matter how good your Bluff is.

I would expect that normally you can only feint against someone you could plausibly hit, which means you need to threaten.

[Deighton Thrane]

From the normal section of the Ranged Feint feat:
You can feint only with a melee weapon, and only against a creature you threaten with that weapon.

So that's probably how it's supposed to work, but the CRB is surprisingly vague on the subject.