Using your Spidey Senses is key. You are vulnerable to grenades and sniper fire to the head when you are on the turret of a vehicle without a driver. Remember, sniper head shots are instant kills. When the enemy drives by in a vehicle, aim for the most unprotected part. The flame thrower and shotgun is god for close combat. Watch the cliffs for enemies. Watch the portals, enemies can appear without warning.
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