First time posting--- game analysis. black to move, blunder

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Avatar of flarhgunnstow
Can someone tell me why this is considered a blunder? It says the ideal move would be: (25... Rxd4 26. Qc8+ Nf8 27. Nxd4Bxd4 28. Qf5 Ne4 29. Qf4 Bxc530. Qf3)
 
Which I just don't understand. I'm not up in material, he's still got his rook defending on the back rank, why is this ideal? I partly pay for a diamond membership to get the analysis, but most times there are moves I just cannot understand. Perhaps someone can help explain to me?
 
Sorry if I've not done this correctly. My first time posting. Thanks

 

Avatar of Nimzowitsch2017

You are up in material and Ra1 gives up a Bishop for nothing after Rxa1 Bxa1 Qa8+, while Rxd4 trades a rook for a knight and 2pawns and gives you a pass pawn