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This could lead to an interesting situation, where in June of 2029 a multitude of double-spending attacks are initiated on various banking/financial software across the world, with the attack lasting a few seconds in total. What a headline that would be... Of course this depends on specific implementation, but I can see how this could happen to a wide array of implementations.

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Looking at how banks handled these kind of issues in the past, they'll shut down all operations for these few seconds and throw away anything that still came in these seconds as invalid.

It sucks for their customers and partners, but that would be a decent conservative option I think.

Somebody should have told the financial institutions in Batman: The Dark Knight Rises that throwing away very obvious unwanted transactions was an option!

On one side it might not be a good idea to have actual actionable and efficient criminal plans enacted in popular fiction.

On the other side, it seems to be a disservice to the community to have stupid ideas widely spread around. It's hard to balance for sure.

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