WTF! button mashing

[normanji]

As title, yes what the fuck is going on, i started the game and wish i never now, on hardest settings and cant even get off siena think its at the end fight the shitty button mashing. Im pressing the correct buttons and it does not recognize it, i get hit then die on 3rd button, ive made it to the 7th button press and cant get past it.
Is there a right time to press, am i pressing to quick to slow, ive tried tapping and pressing hard but just wont do it.