Run to your bunker and just wait a minute or two. After that, for the next minute just try peeking out the bunker (make sure not from the same spot) to find out where the "bad guys" are. Use hand-signals to communicate with your back player. After that, pick your shots. Pretty much like snapshooting.
The main thing I try to do with that is stay steathly. Maybe its not the "best" way to play speedball, but I often get a good amount of eliminations.
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