From my point of view there are some facts that seem to interfere:
First: Even though the Spear and Cube are known as mystical and magical items, they are used to tap into a source of almost universal convertable energy. An energy similar to the emitted power generated by the Arc Reactor. The two energies, if not even the same seem to interfere each other.
Second: It is known that the arc reactor is able to store and absorb large amounts of energy. So it is possible that it absorbed the low frequency energy normally used to correspond and control the victims brain patterns.
Third: As seen the Arc Reactor is not only touched by the spear/scepter but it's attracting it in a magnet-like manner. In my opinion the reactor is emitting an electromagnetic field that is attracting the spear as well as interfering the energy projection which is causing the spear's ability to control the victim's brain patterns.
Even though the Spear and Cube are known as mystical and magical items, they are used to tap into a source of almost universal convertable energy. An energy similar to the emitted power generated by the Arc Reactor. The two energies, if not even the same seem to interfere each other.
It is known that the Arc Reactor is able to store and absorb large amounts of energy. So it is possible that it absorbed the low frequency energy normally used to correspond and control the victims brain patterns.
As seen the Arc Reactor is not only touched by the spear/scepter but it's attracting it in a magnet-like manner. In my opinion the reactor is emitting an electromagnetic field that is attracting the spear as well as interfering the energy projection which is causing the spear's ability to control the victim's brain patterns.