There are groups of people who are grinding in Firefight who will go out of their way to knock people out of their vehicles, destroy their vehicles, and betray teammates so they can get a higher XP grinding. I've seen it multiple times. It's really sad.
I don't get it. How does that help to get a higher XP? If you splatter a fellow spartan or destroy their vehicle and as a result you don't win the match, how will that help to reach a higher XP?
That said, I been splattered on multiple occasions before. Most of these times, i assumed it was accidental, or just recklessness on the part of the driver. However, I do remember a time when it was obviously deliberate - cause I kept dodging and they kept coming back for me until i was splattered to pieces.
Also, I've seen teammates shooting at each other - which seemed to be playful, as gun fire from a fellow spartan has no effect. The one that has effect (that I've noticed) is when a wraith smashes into a ghost, and destroys the ghost. Don't know of other spartan on spartan vehicular destruction.
lastly, I seen spartans come out of their vehicle, destroy it before going into the REQ centre to draw another vehicle. Why destroy it, when some else could use it? There was a time I realised I was the only good vehicle (round of kill 25 ghosts or so) out so I got out of the wraith and requisitioned another from the REQ store. and I could see someone else happily driving my 1st wraith away. made it easier for us to finish the round.