The radio was saying that the combine soldier "Unit" was downed. also the combine are not criminals, and they are actually from the half life universe.
I know the game they are from, they are the wrong unit to have a loud radio. If you know Half Life 2, you would know it would be a CP unit or Civil Protection unit who has a loud radio and soldiers have the quite. I know this is way too detailed for a comment on something cool dne in a mod in a game other that is very obviously not Half Life 2, I just did this because I was bored and didn't take my meds.