Guild Wars 2

So first all NPC disappear and then after a few seconds we die this can happen anywhere

what i think is happening is that the server think we felt through the floor hence the disappearing NPCS while the client thinks we are above ground so we still see our characters above ground the client is right server is wrong and server kills us after falling to our deads probably

also skills that can’t be used because we are in the ‘air’ while just running around