If you check OL-san's expressions in ch.78 and 79, you'll see that there's one panel that we can actually compare, and don't forget it's POV chapters. First is Shibasaki's and the second one OL-san's. From a certain point in the story, Nozomi-sensei has started showing OL-san's emotions (and not just OL-san's, but this is the better example) differently in her POV chapter. I think I mentioned something about that in one of afterwords of mine, but I don't remember exactly. Manga has been evolving and the author was experimenting with many things. Personally I like this duality, but I might be biased.Thanks for the chapter @GolSho! OL-san's actions and outward-expression last chapter don't quite match up with her internal monologue here... more like a rationalization of a deeper truth! (On the character's part or the author's?). But I enjoyed anyway