According to RTE 10, Horan was hit in the knee by an unidentified flying object, presumed to be a shoe, during a show at the Amsterdam Arena in the Netherlands. The shoe just so happened to hit Horan in the very knee that he had serious surgery on back in January and he was later seen limping off stage.
The incident inspired Horan to warn fans kindly not to throw things onstage at concerts, despite their excitement."Amsterdam thank you for a great couple of shows! Appreciate you coming," Horan wrote in a series of tweets. "Also guys! Can you limit what gets thrown on stage please! Coz something thrown at me tonight! Hit my knee! A lot of pain from it! Never wana sound like I'm complaining! But only having my operation 5 months ago, I still get a bit of pain and I'm very scared about it."
OMG please stop throwing things on stage bc it can harm all the Lads. If u are a good directioner please save them from things that can hurt them :) Thanks