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PFS StandardPrevailing Position [reaction] Feat 10

Monk 
Source Player Core 2 pg. 124
Trigger You are targeted by an attack or attempt a Reflex saving throw against a damaging effect, and you are in a stance.

Your flexibility with stances lets you sacrifice their benefits to better protect yourself. You leave the stance you were in, gaining a +4 circumstance bonus to the triggering saving throw or to your AC against the triggering attack.