I think the label of "evil spirit" is a bit much for a hollow. Corrupt? Lost? Empty? They seem more fitting honestly, a hollow is a being consumed by their own emotions, eventually lose their mind and can only sate themselves by feeding...etc.
I don't know if you know but:
Archer version -
I am the Bone of my Sword
Steel is my Body and Fire is my Blood.
I have created over a Thousand Blades,
Unknown to Death,
Nor known to Life.
Have withstood Pain to create many Weapons
Yet those Hands will never hold Anything.
So, as I Pray--
Unlimited Blade Works
Shirou version -
I am the Bone of my Sword
Steel is my Body and Fire is my Blood
I have created over a Thousand Blades
Unaware of Loss,
Nor aware of Gain.
Withstood Pain to create Weapons, Waiting for one’s Arrival
I have no Regrets. This is the only Path
My whole life was Unlimited Blade Works
I have read this book a couple of times, and each time I read this chapter I end getting angry because WHO THE F**K WOULD STAY STILL AND NOT RUN FROM A SHARK. I might seem a bit emotional about it but couldn't you focus on the Empress part of her name for that part, for example it would make more sense as to why she doesn't allow them to leave or why it could be considered disrespectful to turn their backs on her, plus movies involving sharks almost all involve a scene of helpless prey running/swimming from a shark, therefore it seems more like common sense to run when face to face with one.
FallenFromGrace