Dire Tiger pounces a character (bite claw claw rake rake) and successfully grabs. (More unnecessary context in chat.)
On his turn the character pulls out a potion of gaseous form from a handy haversack (i.e. no AoO) and drinks it (which provokes!).
Now does the tiger get an attack as usual, or three including two from (another) rake?
Best Answer
Normally the tiger would get one AoO on the character; however, the tiger can't make AoO at all while grappling.
From grapple rules:
And the grappled condition states:
So no AoO in this case. The only way the tiger can make AoO and grappling the character is using this special rule of the Grab ability to prevent itself from taking the grappled condition:
To be more specific and clarify Hey I Can Chan's comment the rake ability gives you 2 free extra attacks...but they are still 2 attacks. You have only one AoO so you can use only one of your attacks. Before the grapple you had only 3 attacks; now you have 5 against the grappled target but, since this is an AoO, you must choose only one of this five to make the AoO.
(Emphasis added to quotes)