Well, if I was playing white my thought would be ...

does my opponent see b5 trapping my queen?

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I'm almost thinking move the rook on c8 to c3, going after the e3 pawn and threatening the knight.

First move that comes to mind is b5, which leads to a threat to trap the queen with Bd8 next. Of course, queen won't actually be trapped because of Bc7 but you win that bishop

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Your idea to sort of save white does not work ...
Black plays BxB (rather than capture with the rook) and the queen remains trapped.

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Oh right. Funny thing is BxB is exactly what I was thinking but for some reason I forgot that still had the queen trapped.

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That's it. Interestingly, I just played a game where another guy blundered the queen in a very similar fashion, except he played on until he had no pawns left, unlike in this game, where my opponent resigned after b5 and Bd8.

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The knight is defended, though, and it's probably eyeing c5, though. It does stand in the wrong place, but for a different reason.