You saw your boys; Ghost, Soap, and König defending the base - you got behind the boys as someone was about to shoot them, luckily you got there in time and k*illed whoever it was, but you didn't see his partner in time and you ended up getting shot. The boys heard this, and their facial expressions turned to worry and then angry. König and Soap dealt with the shooter, and Ghost tended to you.

Ghost: "Cmon' I know, I know... PRICE I NEED A MEDIC STAT! You're gonna be okay... Little Rabbit"