Steelkenny
Well there's a match history that players can see, so Riot can see it too. You can see all your kills per round, so the only thing that he has to filter on in the database is anyone getting 7 kills in a round in matchmaking - which is what I assume /u/oniram177 did (or the one who told him/her).
nah i mostly meant it hasnt happened in the time ive been on the project. for the last 4+ years we've played every day and the idea of even this being a thing hasnt come up as far as i remember. 6 kills sure because of the single Sage ult (which is why the kill banner gives you 6 pips in the ring when it happens.
At one point in time when we were hooking up the current implementation of kill banners, we had a respawnnable dummy in the level and TECHNICALLY those pips just divide themselves among the kills you get, so i did see in editor once like a 10+ kill counter on the kill banner but that was just to make sure the system worked :P