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The way he got up looked to me like necro rez ult at first.
With the map opening and porting though, it looks to me like he may not actually have rezzed? It looks like he pressed to choose a location to rez, the map opened and he ported there, and for some reason the game animated it in the wrong way. The game bugging out on alive/dead models and animations isn't something new in any shape or form.
It certainly looks REALLY weird though. Especially since you did damage.
I don't think /playdead is the explanation here, he turned into dust the first time and the second one didn't look anything like the emote either.
Necro ulti also doesn't make sense since I don't think you can use it on yourself when you are dead (correct me if I'm wrong) and it's very unlikely that he has two necro friends in stealth who wasted their ults on someone so squishy and alone.
If the animation of porting was game's fault, then first it makes no sense why he was damageable (even npcs focused on him) and second, why he could still run a little before opening map and porting immediately?
I don't want to make assumptions, but because your video shows his name, (which I think is against the rules of naming and shaming) maybe it will make zos look into it a little bit more.