The invisible chosen YI in the summoner's rift!

My friend ,"Miley serious" was simply playing as Yi jungler in a game when he lost his connection for few seconds. He reconnected and got back to his game. He was going to do the blue, as it had respawned, when he used his Q spell and he got invisible. He had the chosen Yi skin so he could only see the blue Jedi sword. He asked to the other players what they could see but they couldn't see him except his sword. I was spectating and he knew it so he asked me but I couldn't see him either. I told him to take a screenshot and to send it to me. Few minutes later he did a Q and was visible to everyone again. It happened for the first time for me/him during the 5.24. It lasted approximately for 3 minutes and was really unexpected so we didn't take so much proofs (the single photo). If this bug already happened to you say it bellow please. Thank you and have a nice day!