Yes, he's a child. One who, from the sounds of it, is someone who's still a fucking rookie.

By which I mean, cut him some fucking slack. From the sounds of it, these guys probably never expected to be in such a situation, and made a split-second decision.

I mean, God, it'd be like calling Superman a murderer for killing Doomsday to save the Justice League (yes, they both came back later, but my point remains).