Foo Fighters and Taylor Swift both played concerts in London this weekend — a fact that was not lost on Dave Grohl.

The Foo Fighters frontman appeared to take a subtle, somewhat eyebrow-raising jab at Swift prior to performing “Statues” during the band’s Saturday night concert at London Stadium. After his mentioning of “The Eras Tour” was taking place at nearby Wembley Stadium led to some boos from the audience, Grohl responded: “I tell you, man, you don’t want to suffer the wrath of Taylor Swift.”

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He continued: “So we like to call our tour the ‘Errors Tour.’ We’ve had more than a few eras, and more than a few fucking errors as well. Just a couple. That’s because we actually play live. What? Just saying. You guys like raw, live rock ‘n’ roll music, right? You came to the right fucking place.”

Grohl has been a champion of Swift in the past, having previous shared an anecdote about the time she “saved him” while he was asked to play at a private Paul McCartney concert. Grohl also lauded Swift for her decision to reclaim her back catalog by re-recording her past studio albums. So it’s possible Grohl’s comments were just made in jest.

However, some fans have speculated that Grohl’s comments may be tied to the barrage of social media attacks his daughter, Violet, recently received from Swift’s fans after she criticized the singer for flying private.

Consequence has reached out to Foo Fighters’ representatives for more information.