“Oh? Isn’t this a Holy Grail War? I’m neither a Master nor a Servant, but I’m free to ally myself with any faction I choose...”
At that point, a dangerous glint entered the homunculus’ eye and her hand produced countless arrow-shaped bolts of light.
“It’s only natural for me to help eliminate the detestable opposing forces, wouldn’t you agree?”

Fate/Strange Fake: Volume 4, Chapter 12 ("Day 2, Morning")