Taylor Swift's fans, the 'Swifties', are well-known for their undying devotion to the pop star.
However, it appears that that works both ways as a video clip from her recent concert has shown.
Swift is currently on her 'Eras' tour in Philadelphia, and was singing 'Bad Blood' at the city's Lincoln Financial Field on Saturday night when she noticed a security guard hassling a fan.
Without dropping a note, she admonished the guard for manhandling the fan unnecessarily, interjecting phrases like 'She's fine!', 'She wasn't doing anything!' and 'Hey! Stop!' between the lyrics of the song.
It's not known why security had attempted to remove the fan in the first place, although some suggested that they were taking photos - which is allowed at Swift's gigs.
In any case, there's Bad Blood between Tay-Tay and that security guard now.
Watch the clip below:
