@Xellie
In that video it looks like the MVP randomly walks out of the icewall at one point?
@renouille
I'm not passing judgement, I'm just trying to understand it.
So I see that in your Ifrit video you used a different trick.
I also realize that the MVP just stops if inside icewall, but that's only the visible effect. Whether it stays there because it can't see outside or because the AI has a bug (does that mean normal monsters with MVP behavior are also affected?) can both have this visible effect. I guess best way to see that is by getting in the situation where a monster hasn't spotted you yet, put an icewall between you and the monster, walk closer and see if it starts chasing you and walk around the icewall or if it won't notice you. Then repeat the same test with a boss monster.