I thought the same thing. As for that trombone like sound I thought it was kind of odd because it came right before that guy got shot in the head. Maybe he should have took it as a warning that some bad shit was coming his way. Next time you hear a trombone in the middle of a battle zone maybe you should heed it's warning and take cover!
you know that was just a sound effect edited into the video clip.. it wasn't actually there