Oki is taking her time inside the barrier.
I have been criticising the author for a long time now, but I feel like this scene with Ms Courier wasn't so bad. I guess the author could have some talent, but is just lacking experience. Too bad isekai/reverse isekai, or most standard fantasy, isn't the best place to gain meaningful experience because the market is so awfully saturated. Series come and go, and there must be a thousand of them on different platforms, with most of them getting kicked out sooner rather than later, to make room for another copy-pasta story. So, even if an author spent a lot of effort to develop themselves and doing extensive research for the story, it would be extremely difficult to make a breakthrough. Getting a manga adaptation that gets "automatically" axed in ~20 chapters must be a scant comfort.