Dude also went 22/7/10 on Lucian before that 2 days of AFK.
My best guess, it's either a boosted account or a win trader, but you are both bronze so that can't be right...
The dude doesn't have a history of afking based on the previous games, it's prob a smurf account (based on the kda of previous games) that wants to stay in Bronze so he can stomp noobs. Also could have been hacked. I don't know. Everyone on the planet has some form of mental health issue so maybe they are just affected by that and choose to act on it in a game because that's where they think they can get the biggest audience.
Things like this make me curious and I'd be interested to see how it resolves itself.
I don't think it should be downvoted because you are legit warning people based on a trend of negative gameplay experience brought on by another player on a consistent (for 2 days) basis. I wouldn't want that dude or anyone like that in my game currently.
However this post does come dangerously close to the board rules about not throwing people under the bus or calling them out in a public display as to prevent witch hunting, and just the fact that we see your name gives us the power to search you and your history so even if you hadn't given a name, your name and the information that a person went afk in your game, will lead us to this dudes account.