Suddenly, a new series of flashes lights up the outcrop. The thunder of heavy weapons rattles your ribcage as you dive for cover. Peeking up, you see the big barrels of mounted machine guns rattling away over the rocks. Looks like the rebels stole some big guns from destroyed vehicles. Slugs that size will cut right through your armor, you know, and if they spray indiscriminately across the field, they'll wipe out your entire platoon.
But you can see the rebels manning the guns. They've had to rise up over the rocks to aim their weapons, which means they're exposed.