Composite Human should have Subsonic reactions.

[Megaquake2012]

http://www.odditycentral.com/videos/modern-day-samurai-can-slice-a-speeding-bullet-with-his-blade.html

All the Details and feat itself are located within this article.

 

[Niarobi_(Formerly_Hadou)]

His slash is moving much slower than the bullet, and the people can see the slash.

 

[TheLuffyPlayer]

It has already been calculated, and it is unfortunately only superhuman

Here is the calc for more info