Good objection :-) If I play 5. h5 then? Blacks position is pretty cramped and I don't see a defence against 6.hxg6 and mate soon. In that case White will drink soda :-)
By the way: One white rook is on f6, so there is no piece taking on f2. The whole line we discuss is:
1.Ne8 Qxe8
2.Rf6 g6
3.Qxh6+ Kg8
4.Rg5 now if
a) 4...Nf2 5.h5
b) 4...Nxe5 5.Rxe5 renewing the threat Rh5