Wait, so ZT got punished for finishing the quest in the allotted time ALLOWED to finish the quest? There is no rule listed that you must finish a quest as fast as possible. Also, it's only logical to send the entire guild a message who was involved in the situation. What if the guild leader wasn't on for days. Let me guess it was still there fault right?
Ultimately it seems to me and I hope this isn't the case, is that a few gm's or one gm was on a character and had to do something and they were waiting for a member. The gm didn't like it and suddenly made a rule that you can't do a quest on the allotted time given. If a gm is on a player it isn't that hard to log on gm and teleport them to the spot. If this is the last situation then you are putting your game play ahead of the players.