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It played in Windows Media Player version 9 for me. Here's a bit of the transcript as I can understand it.
I'm on a dialup connection, and I really HATE streaming video that I can't just download and watch! This took more than an hour for me having to rebuffer and watch.
There are additional voices, but they are mostly unintelligible to me. Some of it is listed on the video, some isn't. Words in brackets were added by me for clarity ("that" was missing several places, making the sentences ambiguous). The words here are the more prominent speakers. I'm assuming the main speaker is the lieutenant.

"There Marines in there?"

"Yeah, they're on the far, far right, far right."

"Coming around the back."

"Hey, who's in here?"

"Coming around."

"What the {expletive} are you doing in there?"

"{expletive}, you almost got shot by tanks"

"Huh..us?"

"Yeah, yeah."
"You guys almost got shot up by tanks."

"They told us to come in here."

"The tanks did?" {something else is said by someone else}

"Yeah, they're telling us [that] people are in here, and told us to come in here."

{unintelligible}

"Yeah, we had two in there."

"You shoot 'em?"

"Yeah, man."

"They have any weapons on 'em?"

{enter building}

"Same guys from yesterday?

"Yep."

{Other voices.}

"Alright."

"These are the ones from yesterday."

Sites, low voice: "These are the wounded that they never picked up."

{Camera shows two men against wall}

"He's {expletive} faking [that] he's dead!"
"Yeah, he's breathing." {Camera view moves up to show Marine pointing rifle at prone man.}
"He's faking [that] he's {expletive} dead!"

{rifle report(s)}

"Dead now."

{end of video}

Other video I've seen has the Marine saying "I didn't know" but I can't find that video now. Also, based on this version of the video, I now agree with you that it was a comment to the microphone that Sites made--that wasn't clear on the version I saw before.

Note, however, the highlighted section I put in maroon. It's clear that some of the Marines are aware these were previously captured enemy--they say it before Sites says it to the camera. I think that the Marine doing the shooting didn't realize that, though. I can imagine the lieutenant being appalled at what just happened...though I'm not sure it was his fault, either...as he just found out about the situation, and it's not even clear if the shooter was in his platoon.