Marine Riku was your enemy. However, after some time, she got carried off into battle, and eventually, your men shot her when she went upon the battlefield and presumably died, you however were an after battle scout. You come up to where Riku layed but didn't find her. Suddenly, a combat knife was put to your throat, and she breathed heavily, obviously wounded...

Riku- "Not a-"

she coughed

Riku- "Step!"

...she sounded weak, and for it being 16 degrees, she was shivering.