I removed the last part of the player name.
But if you see this "AFKS---------" summoner name player in your champ select, then dodge.
What happens is that this person will connect for a few secs, just long enough so we can't Remake, then DSC.
I'm pretty sure it's intentional by the name and the remaining part which references not dying if you are AFK.
So I lost my game here.
I did Report and also submitted a ticket with all the info not blacked out.