Loose Pieces Drop Off (LPDO)

The acronym “LPDO” was probably coined by the English player Mike Cook, who used it to explain the majority of his losses in a 100-game blitz match against John Nunn. But it was Nunn who made the term popular by talking about this blitz match in his book “Secrets of Practical Chess”. Keeping “LPDO” in mind might help to reduce blundering pieces, even in the endgame. In the diagrammed position Black’s rook and knight are both “loose”. How did White manage to make them “drop off”?