Corrected entry: During her fight with Killian, Pepper tore off the arm of a random Iron Man armor and fired a repulsor blast at a mini missile, thereby killing him. How was Pepper able to control the arm? Without a helmet, she didn't have any neural interface with the armor and unlike Tony, she didn't have any implants that would have allowed her to communicate with the armor. In addition, where did the arm get the power to fire the repulsor blast? There was no connection between the arm and the ARC reactor in the chest of the armor.
Knever
21st Oct 2013
Iron Man 3 (2013)
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Correction: The suits were pretty modular. Although nobody else could actually equip the suits, it makes sense that he would make it so that some features could still be used by Pepper, this example being a case in point. And about it being able to fire without the ARC reactor; it's very plausible that it would only need to be connected to draw power directly from it. There could be enough energy in the arm itself to fire off a blast.
Knever
I think the repulsors and other suit functions can be controlled by contextual body movements. Earlier in the movie we see Savin rotate his wrist and that opens up the iron patriot suits palm to expose his bare hand. We hear no audible commands being given there. Same could be applied here with repulsors maybe there's a hand movement like opening your palm fully that fires a repulsor blast.