>dense knives
>fun
Eh ... the 3rd NS ends faster if you just stay below Seiga. There is no reason to shoot Yoshika at all. In fact, you should only see its retard phase with a) Youmu b) a bomb.
EDIT: Nothing happens in the first two non-spells.
i think if you keep killing yoshika, she'll eventually slowly go down, towards you making it harder.
No, she constantly approaches you. Kill her, wait for Seiga to go down, shoot Seiga, misdirect, repeat is how you do it.