Originally Posted by Repulsor Blast
extremis powers were pretty badass. comparing them to the chitauri... no contest lol.
maybe feige meant extremis in another sense though? perhaps tony uses it to internalise his armour?
how did pepper shoot killian at the end with no arc reactor powering the arm? in iron man 1 tony had the arc connected to his arm when he was figuring out repulsor blasts, yet by iron man 3 the logic seems to be that the suits have many different power sources. kind of defeats the purpose of a central arc reactor, i dunno.
In the scene where Tony was underwater Jarvis detached one arm and used it to pull him free of debris. Also, each separate piece of the prehensile Mark 42 armor must have had its own power source in order to be able to fly to Tony from wherever it was and attach itself. In the Miami scenes each individual segment flew in from hundreds of miles away. (I forget the exact distance Ponytail Express gave.) So it is obvious that the armpiece Pepper used in the finale had its own power source since all the pieces did.
Having multiple power sources for the armor makes more sense than powering everything from a central arc reactor. Say the central reactor malfunctions while Tony or Rhodey is in a suit. That would essentially leave them locked in a suit without power, which could become a death trap. They could also be left without weapons at crucial moments. Having built-in redundant power sources would prevent that sort of scenario from happening.