They're speaking Russian.
The first guy on the ground has a broken leg, they say, but it's unclear if they did it or it was done to them. Still, it sounds like they're diagnosing him, not threatening him--they don't ask him anything, at least not on the video. They do seem pissed when they turn to the others still standing.
And after that the "narrative" gets really, really simple.
"Any officers here? Who's an officer?" They go and shoot. Ask the same question, "Who's the officer?" or "commander?"
It goes from "Who's an officer?" to "Who's the officer?" as the presumption in the word order shifts. (Russian doesn't have an article, but that does *not* mean it doesn't have grammatical definiteness.)
On the ground some are in uniforms--but most are *not* in uniform. Those we see shot in the video are not in uniform.
I don't hear any of those shot or being shot saying anything. Can't say if they're Ukr or Ru speakers.
Two of the uniformed soldiers shooting or with the shooter are wearing blue armbands--that might mean pro-Ukrainian or somebody faking it. Most (all?) armbands that I've seen in videos are yellow for Ukraine or bicolor. There's a barest suggestion on the Internet (that I've seen) that blue might mean extreme right, but it's posed as a question more than anything and might be trying to make a meaningless distinction meaningful. And usually the armbands are narrow.
Making it harder to parse is trying to understand where it is. It's one thing if it's in some berg where they can guard prisoners and have them taken away. It's another thing if they're in some place like Mariupol where the options are incapacitate them and move on before you're killed or let them go to report you and come after you again.
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