Lux
I'm pretty sure you can get that warning overturned by just talking to riot about the circumstances and request a reevaluation. It should have chat logs from champ select, so you should be able to prove jax was not communicating and picked top when you called it, then started harassing you after he fed. State that you switched to jungle when you could and jax deliberately followed you to steal your jungle while you were taking it. And that you split pushed and bded the nexus to win. Split pushers rarely have good kda anyways, and if you explain your reasoning and the nature of the game it sounds like an unfair ruling. If your account of it is true, it's one of the rare bad rulings from tribunal. Besides, it can't hurt.
LuxGame2
Ranked