i tried to see that scene in the anime to cleared my daubts about what the hell happened in that moment, but even in the anime it seems they dint had an idea how that happened.
its cool and all
It was needed from minato to use ftg in order to dodge raikages's lightning armor punch but without that he would be death.
minato did a nice moves as expected and got behinde A in an instant, the only way to get in A's back in that fragtion of second.
But my curiousity its, how the hell was minato suposed to hit A when he got to his back if A was charging forward at high speed as the panel shows, A was at highspeed lets say 1000 kilomet per second.
minato got on his back because of instant, in order to minato hit A he needs to be even faster than raikages's top speed which he was not and go from 0km per sec to 2000 kilometer per sec to hit the guy., he used FTG to dodge.
The comical part its that Bee was the ont who hit raikage then minato hit bee lol!
That was instant fragtion of milisend , bee's tentacle its not in hell faster then raikage or minato to do that bullshit.
I am still confused about how kishimoto portraid it because i believe he dint even know how he did it.. check it out in the anime too, you guys might notices that the animator had no idea on how kishi set that panel in the manga.