13M views · 96K reactions | :https://l.mlive.com/snxi6d?utm_campaign=mlivedotcom_sf&utm_medium=social&utm_source=facebook During Katy Perry's Detroit concert, a young fan collapsed on stage after joining Perry to play a shaker with the band. Perry paused the performance until the fan received care, then later reassured the crowd during "Roar" that the fan was doing great. (Edward Pevos | MLive) | MLive.com | Facebook