The same idea. Again observe that Black’s bishop has limited motion (look behind it; it can’t retreat toward a7). So White considers threatening it with b2-b4. Here as before, Black’s bishop gets taken if it tries to escape by moving farther into White’s territory. Instead Black might play Bd6—putting the bishop one square away from the knight on the same rank. Now White forks the two pieces with e4-e5, with cover for the pawn supplied by the bishop at f4. (Or Black replies to b2-b4 with the suicide run Bxf2; after White replies KxB, Black has Nxe4+, and White ends up winning a piece for two pawns.)