Let's grab that description of the Monk's ability again, shall we?
Stunning Attack: The monk can use this ability once per round, but no more than once per level per day. The monk must declare she is using a stun attack before making the attack roll (thus, a missed attack roll ruins the attempt). A foe struck by the monk is forced to make a Fortitude saving throw (DC 10 + one-half the monk's level + Wisdom modifier). In addition to receiving normal damage, If the saving throw fails, the opponent is stunned for 1 round. The stunning attack is a supernatural ability.
The important wording is this: "the monk must declare she is using a stun attack before making the attack roll".
It's a little clearer in the feat: "Declare that the character is using the feat before making an attack roll".
Surely this implies that you can use the stunning ability before any attack roll (even an AoO?), in a manner similar to a grapple or trip?
Cheers!
Stunning Attack: The monk can use this ability once per round, but no more than once per level per day. The monk must declare she is using a stun attack before making the attack roll (thus, a missed attack roll ruins the attempt). A foe struck by the monk is forced to make a Fortitude saving throw (DC 10 + one-half the monk's level + Wisdom modifier). In addition to receiving normal damage, If the saving throw fails, the opponent is stunned for 1 round. The stunning attack is a supernatural ability.
The important wording is this: "the monk must declare she is using a stun attack before making the attack roll".
It's a little clearer in the feat: "Declare that the character is using the feat before making an attack roll".
Surely this implies that you can use the stunning ability before any attack roll (even an AoO?), in a manner similar to a grapple or trip?
Cheers!