If you are in low gravity, you can pick up much heavier objects and throw them at your friends. Getting hit with a 1 lbs rock will do less damage than getting hit with a 100 lbs rock -- gotta love how mass works.
Is there enough wind to MOVE huge rocks and people in space suits? Not really. But explosive decomp in lower gravity could possibily toss a 180 lbs human out the door and a decent rate of speed. And if there was a sudden stop (slamming in to a cliff or another habitat module), that could be pretty damaging. Maybe instead of a sand-storm there should have been an explosive decomp.