indeed after 1..Qxd5 2.Bxd5 Bb6 3.Bf4, black has no defense.
and after white played bh6, the relatively best Bd4 runs into the pretty Ne5, one of those cool deflection tactics that forces white to be mated one way or another.
Tactics time
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I'll give the easiest variation, the first move may be hard to find because it doesn't force a move, but give it a try anyway and take a look at other possible outcomes yourself