Action scenes are sped up to make it more spectacular. It’s a signature technique used in Kung-Fu movies.
[7. Sped-up film stock](https://www.pastemagazine.com/articles/2016/08/10-enduringly-silly-kung-fu-movie-tropes.html)
In Hard-Boiled, John Woo not only uses speeding, but also a lot of slow-motion for dramatic impact.
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