Hi there,
today I found an exploit how to massively harass the opposing faction when they're doing the plants vs zombies quest. What you can do: End the game of the opposing player.
How you can do that:
1. Accept the plants vs zombies quest yourself
2. Logout
3. Log back in - Now you neither see the quest NPC nor other players. But you can attack opposing "phased" Brazies by using AE abilities like Hurricane/Typhoon in front of the house. He dies of ~2 full cast Hurricanes. When you kill him, the game ends for players of the other faction. On top of that other characters of any faction can see you in their game.
Have fun,
styxor
EDIT: you can phase back by simply abandoning the quest