I concur, it's been a while since I've played insurgency although it is a nice game, I didn't know it was done by the same guys as RO, but it makes sense, it's got that feel to it. I recall playing as the Insurgents and facing up against a two man US sniper team, they were good...but they were using the in game speak to communicate, I approached and dropped behind a wall, and then threw a smoke grenade at them. "Hey, where did he go?!" suddenly come over the chat "I can't see a damn thing now!"
Unfortunately as I ran towards them to give them a taste of AK...the smoke dispersed....