afaik the helicoptervideo was taped in 12/01 2003, at least ABC news claimed that, but what do they know. http://abcnews.go.com/sections/WNT/U..._040109-1.html

with about $2000/h that the apache costs to fly it is reasonable to assume, that the men were under observation for a reason and that they had not just been locked on and fired upon deliberately.
as for rules of engagement, any combatant, who is not wearing a uniform, can be treated as a spy and executed stante pedem, even if he is wounded or surrenders.
and sending in a medevac helicopter is risky, remember, about one month after this video was made, these 'freedom fighters' shot down such a helicopter with a big red cross on it, killing 9, among them that one daredevil, who had already survived the 'black hawk down' thing in africa and defeated cancer.