Illya, Miyu, Kuro, Luvia, Rin, and Bazett all head to the mirror world underground in order to face the Heroic Spirit of the eigth card. Centered in the ley line and stocking up a vast amount of mana, the only strategy they have is to through all of their might against him and take him down with their first blow. They unleash all the firepower they possess against that Heroic Spirit, but--?!
I know we promised not to interfere 
with each other, but I'll warn you.
Wir haben zwar abgemacht,
einander nicht anzugreifen, aber sei gewarnt.
Sé que prometimos no interferir 
con la otra, pero te lo advierto.
Sé que prometimos no interferir 
con la otra, pero te lo advierto.
On s’est promis de ne pas se gêner,
So che abbiamo stabilito 
di non intralciarci a vicenda, ma ti avviso.
Eu sei que prometemos não interferir
 uma com a outra, mas já te aviso.