In halo when in Theater mode you are able to zoom out and watch the game in 3rd person with all the UI there, I think it would be nice to be able to switch to this in menu.It would be nice to see your character every once in a while.
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You will see your character in third person, while you're in non-combat areas or scenarios. Making it available in PvP and such basically forces everyone who wants to take it seriously to use due to the abuse you're capable of with camera angles.