system
Given the following post, respond as if you're commenting on Reddit:
human
[Groundhog Day] Why does Phil's piano teacher say "That's my student!" after his performance? Hasn't she only taught him for less than a day at most?

Its in my understanding that since only Phil retains his memories as the day changes, that to the piano teacher, every day would be Phil's first lesson. With every day, Phil begins his first practice more and more skilled at piano, to the point where e begins his "first lesson" already a master. If this is true, and she believes that she's only has him as a student for a day, how can she be so proud of teaching him?
gpt
She taught him that day, he is her student.  He came to her for a lesson, she taught him, and now he's up there playing.  
Even if Phil told her it was his first lesson, she probably does suspect that's not the case.  Still, she's not wrong, and no harm in taking a little credit there.