Tatsunoko is holding a Heroic Spirit hostage.

....Tatsunoko does realize that even the weakest Heroic Spirit is like 10x as strong as a baseline human, yes?

EDIT: Also, unless Mizore has a trait or NP that says otherwise, every other Servant in the room knows that she's a Heroic Spirit because they can detect her.

<Snipped quote by Flamelord>

Tatsunoko picked her because he didn't know she was one.

Hmm... you make a fair point her... she still doesn't want to reveal her powers though

<Snipped quote by Ploxerdon>

I mean, she doesn't have to. It's perfectly possible for her to kick his butt without showing off her NP. Because Tatsunoko doesn't have anything exceptional to keep her from just dodging the bullet and beating his face in with her fists.

<Snipped quote by Flamelord>

Theres also the thing where she is trying to bait the rest into thinking she is weak.
This might catch others off guard.
And she was also caught by suprise, and she doesn't know who is behind her so yeah...

Tatsunoko grabbed Mizore lol, its logical Roland is standing there

Paladin-esque figure seemingly choking out a little girl

<Snipped quote by Arisphadrel>

D: Roland's the one trying to kill Tatsu and thus indirectly save her!

<Snipped quote by Rtron>

BLAME IT ON THE PILLS.

@Flamelord

Caster's Master is gonna trip harder than a party crasher.

@Flamelord And this is why it's not a healthy relationship.