He just missed the “Y”, and if you watch the video you can tell that Harry looked away, I don’t think he even noticed the signing ? He looked Louis in the eyes briefly then back to the crowd - it seemed like the sign wasn’t finished, like Louis stopped cause he realized Harry wasn’t looking in the right direction. It’s interesting how the first 3 letters match up! I’m probably completely wrong but I thought I’d share this anyway just in case, and someone commented how he crossed his fingers which symbolizes good luck/promise/hope but this doesn’t seem finished, plus he does more than just cross his fingers and you can tell there was supposed to be more movement. Someone who knows ASL has gotta take a look at this so we at least have a portion of it right the curiosity is killing meeee.

But most important is the fact that Louis signed at Harry and all is right in the world.