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[Godzilla 2014] Spoiler question, please check inside

Why didn't Godzilla have his atomic breath from the beginning? What caused it to appear? Also, it felt like he got more coordinated in his fighting as time went on.
gpt
Godzilla's atomic breath uses up a great deal of the creature's energy reserves. Using it twice and sustaining it for only a few seconds each time caused the creature to go into what can best be described as metabolic shock and lose consciousness. It's actually being argued now that the higher than average radiation levels brought on by the nearby nuclear explosion are what allowed the creature to wake up so quickly.

As for Godzilla's fighting prowess, we aren't really sure. Early reports are theorizing that the creature has a rudimentary intelligence due to its ability to formulate a defense on the fly that ultimately led to its victory against the two M.U.T.O.s. Also, Godzilla could engage either of them individually without much problem. Their dual efforts were what really gave him difficulty. He was only able to kill the male MUTO after the female had been distracted by the destruction of her eggs.

Another indication of a kind of intelligence is the creature's seemingly benign attitude towards humanity. News reports are calling him "King of the Monsters" and a "savior". People everywhere, and in Japan in particular, are in absolute awe of this creature.