I had an awful instance of this myself this weekend on Ghosts. The brilliant new mode Infected involves one player being nominated as the first infected, and he has to chase down the rest of the server, killing a player and infecting them, allowing him to build his army of infected until the whole server has been wiped out. It's a great mode that can be ruined by boosters, meaning players who are known to each other and deliberately end up on opposite teams so that they can help each other boost their stats up. In the case of Infected, one infected player used his body to block the doorway to his uninfected friend, so that the rest of the infected players were unable to get through and reach him. Instead, he hid in an alcove inside the room so even projectile weapons couldn't reach him, and he won when the timer run out. It's super lame, selfish and simply not very sporting.
Stay at home dad who spends as much time teaching his kids the merits of Martin Scorsese as possible (against the missus' wishes).
General video game, TV and film nut. Occasional sports fan. Full time loon.