Battle fuck is split into two phases. attack and defense.
during attack you pick the move (HJ, Bj, Ect) that will have 3 variations depending on what you unlocked (Z standard, x or c as variations). you spend you stamina to reduce enemys EP. you dont want to use too much stam because at some point the enemy will counter and you will need to defend.
during defense the enemy will reduce your stam, you can slow this down by HOLDING the button prompt z,x, or c. stats also play a big portion: get more stam to get more stam bar, def to reduce the time for counter, sp def to reduce dmg taken.
i accidently put my stats so heavly into the defense and sp attack that i take no damage during the counter, and they only GET to the counter if i let them