I was looking at the Halo Reach picture and I pointed out my thoughts about it here:
[url]http://i609.photobucket.com/albums/tt173/Alex_Mercy/haloreachnew.jpg[/url]
[Edited on 06.22.2009 6:13 PM PDT]
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I hope that it is not a tail. If it is that would ruin the Halo series for me forever. I personally think that it connects to his/her/its weapon.