[Spark]

YouTube - Sen's Class: N+1(2+1) Broad Sword

its basically just like the video you hit, you wait, then
attack twice

N+1 means normal attack plus 1 extra attack like for example broad
sword has a max of 2 attacks after you perform 2 attacks the monster
will be knocked back but when you do N+1 you attack once, wait for a while
when you swing your sword back up then you attack again twice then monster
will be knocked back you basically get a extra hit in