The current idea may become slightly harder to see, but structurally no different, when the pieces involved are compressed in a small space. White has attacks against Black’s bishop and knight. Black’s queen and knight protect the bishop, and his queen protects the knight as well. The fact that his queen is protecting both pieces suggests a vulnerability. White experiments with captures and the move orders involved in them and sees that if he plays BxB, Black is in trouble no matter how he replies: if he recaptures QxB, he leaves his knight on c5 loose for the taking; if he recaptures NxB, he leaves his queen loose for the taking.