Do I need to react?
See one thing about chess is that sometimes we overreact when we lose a piece or when we lose momentum, and sometimes we underreact when we miss a win or a piece takeover, so I'm guessing this puzzle is meant to teach us a bit about control and to decide correctly after missing an important piece...
This puzzle is rather stupid because the moves are counterintuitive, there's no way black would behave like that, let alone let himself be caught in a situation like the one depicted here but, what can we do, here's my solution: