Don't detonate the explosive devices around you, as you'll need them in the coming fight. This grassy location is littered with Quarian and Varren corpses alike, but there's a lone, remaining Quarian on the left side of this open area, near the outset, that you can approach and 'stabilize.' Doing so is part of the side quest, so be sure to do so straight-away. As you push into the next area, you'll find out precisely what's happened to the Quarians.
