Why did the fight take place during Paramore's performance?

The American rock band Paramore was formed in 2004 in Franklin, Tennessee.

Hayley Williams, guitarist Taylor York, and drummer Zac Farro currently make up the band.

In 2005, the band released its debut album, All We Know Is Falling.

The fight broke out while the band was performing in Toronto, Canada.

The band was performing "Caught in the Middle," a 2018 song.

Upon noticing the scuffle, Williams immediately stopped singing and addressed the crowd.

She added, “We’re not a hardcore band, bro. We’re gonna dance tonight, we’re gonna have fun. You got me up here acting like a teacher. Detention for everyone!”