https://reddit.com/link/k229eq/video/x1i7x330os161/player

Hello, my in-game name is HSPASS and I was watching one of my friends stream while working and out of nowhere this Reyna character seems to be unkillable and is just walking forward, suddenly the same ghost-like character disappears. I have no idea what kinda bug this is, so I was wondering if anyone here could enlighten me. A little bit more context, this is a ranked game my friend is high diamond so it should be a full diamond queue, the server is probably Madrid, and is ping should be about 20-40ms. Also, I'm pretty sure he wasn't lagging or has ever had something like this happen in any game mode. If anyone has even the slightest clue of what is going on here I would really appreciate an explanation since I have absolutely no idea what could make this behavior surface in-game especially in a ranked match (imagine if something like this would happen in the first strike it could be game-changing).

TLDR: Unkillable Reyna walks from split ramp to ct and disappears. Gunshots do nothing to this thing and it makes my friend lose the round.