Well the discusion about the new image was very LOOOng . I have come to conclusion . There is a red team a Blue team and a freelancer team . The freelancer team can kill anybody and when they kill ,ore reds (like in the pic) the part of the armor becomes blue so they can ride in hogs with them , etc.
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ok ... lets say you have Blue and Red teams fighting . The Freelancer will preety much clear everithing but they can also make a truce with Red or blue . Remember how in Halo you can only carry people with same team color ?