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Whatever the original cause, the current behavior actually sounds like an engine problem to me, caused by an over-rev. Your story parallels exactly what would happen if you downshifted into too low of a gear on a manual transmission car and over-revved the engine (in this scenario, it's a mechanical over-rev and the throttle-based rev limiter can do nothing).
I thought the DCT was supposed to nanny events like this, so that a user technically couldn't downshift into too low of a gear at a given speed. If so, then some aspect of the DCT control went haywire and either let you drop into too low of a gear, or did its own downshifting into too low of a gear. If not, then maybe you tried to downshift too low.
Give us more details on the speed and the gears when it happened...
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