A trap in the London System

In the game below, 4...e5!, forking White's knight and bishop, wins a piece since Black's pawn, seemingly hanging, is indirectly guarded by ...Qa5+. My inspiration for this trap was NN-Pandolfini, a Kan Sicilian with the same motif: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bf4?? e5! The concept was also seen in Zaitsik-Zichulidze, Tiflis 1976 , which is the same as my game, but with colors reversed and White having the extra move g3.