I watch the radar if I see red I pick it up. If I don't see red then I'll wait. Reason is if they are hovering around our heavy it's because they have a super. Sometimes they are just stupid but not very often. I had a guy recently approach pretty much our whole team while we were getting heavy. He casually walked up and started shooting at all of us with his primary. He received a couple rockets and a bunch of heavy machine gun bullets.