The world suddenly froze as Swiss fell to the ground, blood soaking the playground sand as the kids were screaming. "Granny!" Izuku cried, tears falling as he ran to the limp older woman side. Netsu stood back, his paw shaking as blood dripped from his jaw and his eyes widened at the realization he had done. "No...What Have I done...no...Swiss...no...Izuku...I am so sorry." He said, a whisper in the wind at his tragic mistake.

This is after Netsu accidentally killed Swiss, Izuku grandmother. He felt severe guilt and truma from the incident and let his grief out in anger and Denial while Izuku did It in Sadness and Bargaining.

The music during the scene 

https://youtu.be/LfQpCbvO02g

The funeral song for Inko, Izuku, Yamārashi and Netsu

https://youtu.be/bl91oNj6_mI

In heaven Swiss had forgiven Netsu cause she knew it was an accident