Sett R causes crazy visual bug.
https://gyazo.com/c5e085f048a0c98c42bf71c7bd81c45c
Everyone who was present in the fight claims they saw it as well. The enemy botlaners as well as my support claim that their screen also turned blue while watching me being Sett ulted.
I have no clue if it is reproducible and therefore do not have steps to reproduce.