The obvious answer is to stop their movement but I’m wondering if you guys have any other ideas?
You cold also share how do you deal it in your stories
Speed isn't the determining factor to a fight, though as opposed to what the thread may tell you, they still pose a threat. In most situations, you'd only find those who strike fast but wild. They'll throw punches like crazy but most of the time, they only care about whether they hit, not where they'll hit.
Now, speed + accuracy. THAT'S a fearful combo. You can argue about strength all you want but the truth of the matter is that there will always be some part of the human body that's susceptible to even the tiniest of force. Under the chin, on the side of the head, the shins, et cetera. You could GUARD those places, and you'll sometimes succeed, but at this point, if you're facing an enemy that's fast and precise, chances are they're also well-balanced. Light like a butterfly, sting like a bee type shit.
Of course, you can always catch them lacking. Every human being has a pattern. The way to beat those fucks is to lure them into a false sense of relief, where they think you're falling into a pit of repetition with your moves. That would require stamina and endurance but if you can do that, you can play farce for half a minute of so before diving down for their kneecaps and taking them on a temporary visit down the waters of Babylon.