Was it a Bunyan or Sitonai though?

Sitonai is story-locked. That means if she didn't have rate up, she won't showed up at normal banner, so definitely not Sitonai.

Well if they have her unlocked its possible.

Not in this banner. This banner didn't have Sitonai as "rate up" servant, so it's not possible to get her from this banner.

Really? So story locks can't spook? Huh.

The only time when story locked servanst can spook you are on special banner, like this year's Chaldea Boys Collection (only males tho)

Yes, unfortunately SRs are harder to get than ssrs a lot of the time (yui pulls flashback)

Well that explains why I've never been able to pull quetz... I wonder why the devs made it like that.

Oh, well, Delta... I guess you've seen as I already told that history here a few times, so I won't to it again, but... you know I feel that pain.