Just noticed that as well.
Not sure if this manga is now licensed and Mangadex has to remove them, or if there's a scanlation group drama going in the background.
I also fail to see what point Muscle-hime is trying to show here. Nothing she did so far in this duel can be interpreted from an outsider that effort is a good/virtuous thing as much as talent.
What does a Boston Crab that even a relatively normal person could do to someone uninitiated even...
Is it more about burnout?
I don't know if this word is also used in Japanese, but that would be my first guess.
Also there's a promise of MC in a nekomimi maid outfit. Can't wait to see that.