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Black holes are conjectured to be the fastest quantum scramblers in nature,with the stretched horizon being the scrambling boundary. Under thisassumption, we show that any infalling body must couple to virtually the entireblack hole Hilbert space even prior to the Page time in order for there to beany hope of preserving the often-cited claim of the equivalence principle thatsuch bodies should experience `no drama' as they pass a black hole's horizon.Further, under the scrambling assumption, we recover the usual firewall resultat the black hole's Page time for an initially pure-state black hole withoutthe need for any complexity or computational assumptions. For a black hole thatis initially impure, we find that the onset of the firewall is advanced totimes prior to the standard Page time. Finally, if black holes really doefficiently scramble quantum information, this suggests that, in order topreserve this claim of the equivalence principle even prior to the onset of afull-blown firewall, the quantum state of a black hole interior must be aBose-Einstein condensate.

Black holes, fast scrambling and the breakdown of the equivalence principle