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Either way the tour is done, better secure the podium.
It was about winning the stage, not winning the tour, because yes, it's pretty much done. The stage is what Pogacar wanted; he made that clear earlier when he attacked the favourites group. That he couldn't drop everyone was his problem, but Vinegard decided to share that problem, giving up his opportunity to sit on and have a good chance of getting the stage and further neutralising Uran for free in the process. Uran had already been dropped by this point.
He didn't win the stage and he didn't secure anything, in the end.
He would be a lot more inclined to do so if Vingo was just sitting. Or just sit behind and save himself for a sprint. Either way the tour is done, better secure the podium.