Without looking at the next chapter, I'm guessing that Kusunoki is going to improve a line about how it's expected that the beast would trip if it's her first time dancing. Then she's going to improve teaching the beast to dance while Irie gets over her anxiety. It'll probably look like it was all scripted, and Irie was playing her part perfectly from the audience's perspective. However, her father is going to recognize that it was a genuine mistake, but he's still going to praise her for her performance.