flood glitch, enemy spartans

So, this has been going on since the I got Halo 4 on launch day. When I play flood some times there’s another player who is shown on an enemy team (red crosshair) but he is just a spartan in a different colour so I end up killing them and I get booted for team killing. In the future I just won’t touch these guys but is this a common thing?

Yeah, I have a saved film of this happening to me as well…very weird glitch, huh?

i think that happens when someone joins in progress, when i joined a flood game that was in session, my character became black and got an assault rifle, and i started killing everyone. Even when the flood killed me i still didnt get infected