Look closely and you’ll see that, once Cavill enters into fight mode, his mustache magically turns into a full beard, the better with which to protect his face. In recent interviews, Cavill himself has said that a fake mustache “would not have been a possibility,” but that he couldn’t spill the beans until Fallout’s release.

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Sure, there’s plenty of other, more logical explanations here, such as a trick of the light or a post-production snafu. Or, as was pointed out by a fellow Twitterer, there’s the possibility that the mustache is motivated by pure, unfiltered adrenaline.

We’ll find out for sure when Fallout hits theaters on July 27th. In the meantime, check out the latest trailer for more clues.

[via Mashable]