How do you beat mission 7 tactical assassin 3

Fist shoot the guy at the top of the barn (I'm talking about the bored.com Tactical assassin 3) Then shoot the light your 2 friends outside with shoot the others and save the captured guy

other way: get a semi-auto sniper rifle and shoot the 2 downstairs quikly before they can shoot the hostage, no need to worry for the one upstairs.