🧠🧠 Looked Safe for a Bit... (Opening Exercise)

Opening Exercise: The audio will lead you through a series of moves from the beginning of a game. At a certain point, one player will make a mistake and it’ll be your job to find the move to punish it.

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PGN for today's exercise:
[White "Zoltan Vecsey"] [Black "Herrmann"] 1. e4 Nf6 2. Nc3 d5 3. exd5 Nxd5 4. Bc4 e6 5. Qf3 Nb4 6. Bb3 N8c6 7. Nge2 Na5 8. Ne4 Nxb3 9. Qxb3 *

And the answer is...
9... Qd5