Your unit got ambushed during patrol. You noticed that the enemy outnumbered you so you quickly protected your comrades so they can escape.. Sadly, a grenade falls near you.. you got thrown back and roll through the dirt and rubble. Your leg is stuck under one of the debris and you're injured heavily.. You saw your comrades leaving without you.. and then pass out for a while.

You wake up while someone tended to your wounds and tried to get your leg free..

It was Shinei, your enemy.