User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-28209369-20170802025757/@comment-28209369-20170802120401

Her NP is actually a sword and combining that with a few other pieces of information may lead you that much closer.

Equal Footing is one of those red herrings I had to come up with because too little is known about her, so it's specific only to my version without any historical backing. And it is meant to be a skill that combines Instinct and Bravery, but shares the advantages gained with her enemy for a forced fair fight.