Argh, too much silliness about reaction time.
A second is a frikkin long time in a game like Smash: for some perspective, consider that a Falcon Punch takes about a second. The game runs at 60 frames per second, and ordinary human reaction time is (iirc) ~150 ms = ~0.15 seconds = ~9 frames. When amped up on adrenaline, you can react faster: I think somewhere around ~100 ms or a little less ( = ~0.1 seconds = ~6 frames). There's a physical lower limit on reaction time that depends on the speed of nerve signals and the distance that the "fingers move this way now" order must travel (down your neck, through your shoulder, and then down your arm to your finger muscles in your forearm). The brain itself also takes a certain amount of time to process the video and audio input that your eyes and ears are giving you, and this processing is really really complex (so the time it takes to do this processing is non-negligible). This means that it's utterly impossible to block something like Fox's 1-frame Shine or Marth's 4-frame Dancing Blade on reaction; if your adrenaline is pumping, it should be just barely possible to block Marth's 10-frame f-smash on reaction (I'm assuming you're correct about that figure, A2ZOMG). I don't know how quickly Samus's z-air hits, but it's obviously rather quick. Since some moves physically cannot be blocked on reaction (making their use a double-blind guessing game), you have to predict when your opponent will perform this move and try to preemptively block it -- hence mind-games, adaptability, and the edict to avoid being predictable.
That's all reaction time, i.e.
reacting to what is happening externally. You can perform memorized sequences of moves much much faster than human reaction time, because you're not reacting to yourself (hence why we say "coordination", not "internal reflexes"). Talking would be excruciatingly slow if you had to wait ~0.2 seconds after saying one word so you could react to your own speech and start saying the next word. You ever heard a good piano player play a piece that is even remotely complex? They're not reacting to their own playing in order to figure out the next note, they are running through a sequence of hand motions that is timed down to the fraction of a second. So yes, it is humanly possible to perform sequences of hand motions (like the hand motions that cause Fox to repeatedly drill-shine) where the delay between each input can be measured in single frames or tens of milliseconds, and this doesn't actually say much of anything about the player's/test subject's reaction speed.
</rant>
In other news, I like/am amused by your use of the word "FRIEND", ptown
/RtEB