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That's related, in that a flashstep is often how the technique is performed, but the defining trait of a flashstep is "moves so fast it looks like teleporting", which is not a requirement of this thing. (Completely by accident, the first three examples I came up with are definitively not flashsteps; all three move slowly enough to see.)
she her hers hOI!!! i'm tempe
That seems to be a subtrope where someone using this technique is countered by another use of this technique.
By all appearances, we don't have a page for the technique itself,
she her hers hOI!!! i'm tempe
Do we have a trope for this? Examples immediately springing to mind are the "Reversal" Action Command in Kingdom Hearts, one of Regal's moves that I can't remember the name of in Tales Of Symphonia, and Splash of all things in Pokemon Super Mystery Dungeon. I'm sure it's appeared in anime and whatnot as well.