A similar thing happened when Michishige Sayumi injured her leg during her graduation concert, with similar responses.
The goodbye speeches at the end of a graduation concert are often this. Slightly subverted by Yoshizawa Hitomi who teased several of her bandmates for crying, claiming she was embarrassed by it.
Seeing how overwhelmed with joy all the members of Morning Musume were when they won a JRA for Best New Artist.
The quasi-reunion of W. 13 Years, after the suspension of Ai Kago from the label, she and Nozomi Tsuji reunited on the stage. Both even mentioned that they might have been sisters in a previous life. Its sweet to see these 2 are as strong friends as they were before.
after she had fallen and sprained her ankle badly in a performance earlier that day. May also be a CMOA for Takahashi having the willpower to get back on stage for the second performance.