Well last night I ended up partnered with one of those dickheads so it was quite easy to tell as if I spawned next to them camping I shot at them, melee attacked them,threw grenades at them and actively got the enemies attention to kill them!
It was hilarious the dickwad I was was getting really pissed of with me another tip is just stand next to them and spam with the " I have a really bad feeling about this" gesture!
The best part was despite camping behind boxes on a bridge in the hangar level for most of the game- he came last, I hope my efforts contributed to that