Here's the story of this video.
The SAA (Syrian Assad Army) was ambushed and mowed down by machinegun fire of the Free Syrian Army. Immediately a handful of SAA soldiers were dead and/or wounded, while the majority of the force had retreated to less open ground and assumed sniper positions.

The FSA (Free Syrian Army - The main rebel group fighting against the regime of Bashar Al-Assad) then advances and tries to either take some prisoners, but they notice they are all either dead or wounded. They spot a young officer still moving even though he seems to have been hit by a bullet.
As they attempt to capture and in effect save his life, the SAA opens fire right above the head of the wounded SAA. You can clearly see bullet(s) flying into the wall just above the wounded soldier at 0:55 seconds