Most of us would be stunned for a few pages if we slashed someone who could barely move and then he started doing his motivational flirt or whatever it was right after it.
Part of me is starting to hope that we end up finding out the MC likes realist girls and ends up falling for Inori, for some extra chaos.
Don't think that is likely to happen at all though.
I think he saw it as proof of how hard she tried to perform mostly for him due to the special occasion. Iirc he is attracted not only to her clumsiness but also how hard she tries to overcome it.