While the man's dragging the shot one into cover, Isaac tries to trace the shot back to the sniper using the angle the bullet entered and left his leg. (
Here's the roll) He finds the sniper crouched in the distance and notices that he's gearing up for another shot, this time for the man dragging the injured. It doesn't look like it'll be a leg shot this time, but it also doesn't look like Issac's within distance to accurately hit him.
"Dammit, I knew I should've picked up a Javelin." He mutters to himself, knowing his Stinger doesn't lock on to non-vehicle targets.
"Get behind cover 5 minutes ago!" He shouts to his men and fires off a spray of 10 bullets. He doesn't expect to hit anything with his terrible luck though, so he only used is to distract the sniper from his men as he sneaks through the forest, using the trees to hide himself as he draws closer and closer.