I still don't understand how the blue outline works if the enemy Yoru uses his ultimate. Does it appear only when he's looking at you (if yes, from any distance?) or if he's close at a certain range?

I played a game vs a blatant wallhacker/aimbotter. He had 45 kills in 14 rounds insta killing everyone etc. I’m currently in dia3 and he boosted his friends from plat 1 to immortal 1. (I added him to see his match history). I reported him s...