Ok... When I doig baalruns, when Mage+skeles spawn there.
Sometime I see Dark-blue balloon. wtf is that?

Run Video test.

its not graphical error..
Its real "cast" thing. happends exremely rare, but saw it alot. with many other computers.
and even many other real d2 players also see that same thing sometime. and when it shows all peoples in baalrun will see exacly same balloon.

but peoples who always use "automated character mover, while they afk, ofc they never see it)

i see it once in a while at wave 2. don't know why.

I've seen it often too but dunno what that is

The bug appears when you take the town portal from Harrogath to the Throne of Destruction during the second wave. There have been plenty discussions about that bug, but without any clear explanation.

Oh i thought it was a curse from achmed the cursed or whatever his name is for himself and his friends from wave 2