The Pandemonium ignoring Immortal locations bug causes some weird stuff to happen in PvP.
Basically, the when Pandemonium is played and your opponent has immortal creatures, your creatures are ignored right?
But in PvP, the other player will see pandemonium work properly: the creatures die, and then come back to life as the game fixes itself.
This DOES trigger death effects, causing the game to desync again as it gets passed back to the person who played pandemonium, causing Skeletons to appear out of nowhere and vultures to jump in attack.
Screen Shot #1: The field after I end my turn.
Screen Shot #2: Pandemonium is played. Everything dies.
Screen Shot #3: The Cat and the Photon come back to Life!