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okay, so remember when aang finds out that fire nation soldiers were at the southern air temple and enters the avatar state and the statues' eyes in the air temple sanctuary light up?
and then after that the different avatar temples in the other nations also light up?
so does that happen every time the avatar goes into the avatar state? or only the first time it happens?
so either way, they really should've noticed it sooner, like when aang went glow mode three times before this??
one when he first created the iceberg to protect himself and appa
two when katara cracked the iceberg
and three later in zuko's boat
and even if we consider the first two to be one long extended avatar state like some theories suggest, even then the temples^^ should've lit up two avatar states ago...