chess.com daily puzzle 20211206, The Pawn That Lacked Hindsight, black to move, Step 2

chess.com daily puzzle 20211206, The Pawn That Lacked Hindsight, black to move, Step 2

Difficulty level: Step 2

Key concepts: profitable exchange

Rook for NBP, 5 vs 7 

My analysis: https://youtu.be/b1aowpSX8BE