Skrillex and Deadmau5 traded shots during the late hours of Halloween. Trust us, it wasn’t nice.

During their heated exchange, we learned a few things about their relationship. Deadmau5 was one of the big names that co-signed Skrillex’s career early on as a producer and DJ. However, Deadmau5’s threw shots at Skrillex’s latest output, particularly his side project Jack Ü with Diplo and his hit single “Where Are Ü Now” that features Justin Bieber.

Skrillex fired back and accused him of bullying a fellow EDM artist over social media. “I'm forever grateful for the mau5's early support but the reality is sad. He's shriveling In his own pile of hatful [shit],” he wrote.

mau5’s response after Skrillex went after the merits of his record label: “Tell you what. Lemme borrow the lil popstar for a week, mash together a radio hit in 23 minutes, and will be good label! Yay! In summary: 2 EDM sellouts bitching about who's got a good label and or who's sad. Welcome to 2015. That's about all I'm getting outta this.”

Read the whole thing below.