Serbo-Croatian (SC) appears to allow extraction of PP-complements out of NPs and APs. This extraction is problematic for Bošković’s (forthcomingA) approach to phases because SC NPs and APs are phases in this system and complements of phase heads in principle do not move (Abels 2003a). I show that there is a mechanism that can be extended to account for these movements, and provide a unified account for these movements, a certain type of left-branch extraction, and extraction of inherently case-marked nominal complements, where all of these involve P-incorporation into the element moved to SpecPP. Independent evidence for P-incorporation comes from accent shift from the host to the preposition that occurs in SC.