A question about Illaoi

Situational.

If she pulls you and there aren't tentacles attacking the spirit, and you're on even footing (she's not ahead/you're not behind) you should fight. The more damage you deal to her, the less time she has to use the spirit for additional damage. Plus, if you attack from a direction the spirit ISN'T in she can't get the bonus damage from Qing it if she only hits one of you.

If she has tentacles, I'd say run. You can dodge and farm the tentacles it spawns while it wears off. If she has a team or her ultimate ready, definitely run.

And remember, if she ults you the best thing to do is disengage.

I saw this on youtube, I feel like he has sumerized the concept of playing against very well I will link it. Watch it the guy is sacastically funny. But if you are too lazy to watch the video, the tl;dr is if its late game and she pull your soul, you almost always need to run away since her team will chunk you down to half hp and a fight will broke out if you don't disengage immediately. In lane it depedends if she have the tentacles set up or has ult. And it also dedpends if you are ahead or have jungler help.

https://www.youtube.com/watch?v=SLiTGQML3pI

That skill is probably the best nonulti ability in the game. Whatever you do, running or fighting, she will take half of your hp.