This is the explanation he gives for the video on the Youtube page:
I got hit a total of four times. My helmet cam died and I made it down the mountain on my own. I was also hit in the side of my helmet and my eye pro was shot off of my face. We were doing overwatch on the village to recon and gather intel. I was point heading down the face of the hill with the LT when we got hit. The rest of the squad was pinned down by machine gun fire. I didn’t start the video until a few minutes into the firefight for obvious reasons. I came out into the open to draw fire so my squad could get to safety. A round struck the tube by my hand of the 203 grenade launcher which knocked it out of my hands. When I picked the rifle back up it was still functional but the grenade launcher tube had a nice sized 7.62 cal. bullet hole in it and was rendered useless. This footage is part of an ongoing documentation of the war in Afghanistan.