As in the title.
The spawning point of the mobs too close to when you leave the quest area.
Considering that the Bogs are an area which loads the ~longest~ of all, and considering the sight range of the Assassin Vines, it may result in players being transition raped (aka slaughtered/paralyzed before the area even finishes loading), having absolutely no means to defend yourself with if your graphics card isn't fast enough.