He may not have had the supplies to heal - there is a limited amount until recharge.
I generally play as a medic. I try to pick anyone i can up, not only is it worth 175xp but another healthy teammate running around (even if the A.I. isn't always looking to watch your back) is another target out there that is not me. If you follow a medic around they will pick you up, or i will if i can.