User blog comment:Blackjack22/Typhon`s defeat/@comment-3146930-20120318215635

I am still standing by my theory that because Typhon is so powerful, there was an equally powerful amount of Mist clouding him from view from the mortals (demigod and human alike). Percy even states that he couldn't see him clearly when seeing him through the viewing globe. The gods themselves would need to take on their true forms in order to make a dent in him and would likewise use a large amount of Mist to make sure any TV reporters filming it didn't turn to dust.

It is also possible that they werent in their true-true form as Hera is described as looking like a supernova. It is possible the gods were in a power saving mode. A mode that allows them to use almost all their power, but over a longer period of time.