animation for button mashing fighting game

Hi guys..
I want to make beat em up game, that user can be button mashing
but when using animator I dont get it how to make it animation like that

my refrence is from Ragnarok battle offline game
as you can see in this video

that swordman can be button mashing strike
when not in button mashing (normal punch) we can see 3-4 frame for punch + 2 frame recovery animation (clench hand into open hand)
but when button mashing we it seems 2 frame for punch without recovery animation

can animator in unity control what frame will we use ??
or speeding up animation or something like that to ??
or anyone had solution for me ??

 

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