We're all familiar with casting a wall to begin a duel. However, since someone griped at me the other day for "buffing too soon", I'd like to ask this:

Does the duel begin when the _entire_ wall is gone, or when the first piece disappears.

To me the answer is as soon as any of the three pieces vanishes. It's not like you can predict which one is going to go *poof* first. I think some people will cry over anything if they lose a duel but what do others think?