Select the sniper weapon set.

Set blue & red team with green weapon.

Make sure which is leader in the room. He may wear a green or blue turban (randomized).

Use sniper shoot the leader first. The remaining suspect will stick with hostage but no worry.

Ready your member to breach (boom) the door.

At the same time, ready your sniper. Kill the two remaining suspects when the hostages are startled by the entry (as they duck out of the way).