Since Liam never revealed what kind of illness he had and the guys managed to go on the next night with their scheduled concert, it's all too easy to start speculating that maybe stress played a factor.
Yeah, we're not buying it either, but here's what a source told The Sun (via Unreality TV): "The pressures of fame and being on the road for two years have made Liam ill. He was devastated about letting everyone down, especially the fans, but he wasn't physically able to get on stage. He had a complete meltdown."
Mmhmm. Insert eyeroll here.
Liam did later apologize on Twitter, with no mention of his mystery illness, writing: "I'm so sorry to everybody I disappointed last night. I'm feeling better now. I really hope everyone can make the rescheduled date on Friday ."
In a sitdown with ET this week, Harry Styles explained what was going on behind the scenes at the concert, saying, "It was very disappointing for us, as well. We're very disappointed for the fans... When someone's unwell and you're unable to perform, you can't do it."
They did want to go on stage, but realized at the last minute "it wasn't going to happen," Harry said.
Louis Tomlinson further added, "I think it all happened so quickly, really. We were all stressed out about it and disappointed, and just at the end, that's the way it worked out."
Niall Horan assured that Liam was "a lot better," with Harry adding, "He's resting up."