4...Rxf6 5.Rc3 f4 6.Qc2 Nd7 7.Qe4 Qh5! 8.Qf3 Qg5 9.c5 Ne5 10.Qe2 dxc5 11.d6 b6
With a sound extra pawn and preserved attacking chances, Black is clearly better.
Heading for a7 in order to seize the g1-a7 diagonal, where there is no opposing white bishop.