Stay with your teammates, or at least where you can support them. If you flank but see you've been spotted, abort. First death quite often decides a round so try not to get picked off, if your team downs an opposing player then do your best to control their ghost. Your goal following on from that should be to force the remaining two players to engage in a 2v3 on your terms.
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Ok thanks. I'll try and keep that in mind. What about loadouts?
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Whatever you are most comfortable with.