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