Luckily, the fan posted the video on YouTube and explained how things unfolded, writing: "Here's how it went down. It was near the end of the show and I caught eye contact with Liam. I made a gesture if I could throw my GoPro on stage and he gestured back to do it. He filmed for a bit, then said he was going to film Niall's bum when he wasn't looking.. He did that and then quickly turned it back when he turned around."
The fan added, "He was about to throw it back when I mouthed 'Harry' to him. He looked down the stage and saw that he was too far. He was about to start walking down the stage to get him when he turns back and says 'I can't' and I was gesturing him to take it with him, and he said 'I'll walk up there and you'll never get it back' and then threw it back.. But he ALMOST did it for me :)"