The Flash Grenade blinds every enemy close to where it goes off. It buys you a few seconds to rush a room, escape or line up headshots while soldiers stumble around.
Throw it into a room before you enter, or at a group that has spotted you. Use the time to close in and finish them, or to break line of sight and get away.
Special Forces Assaulters can flash you too. If you see one turn toward you at close range, look away or back off.
Bait
Bait is a chunk of meat you throw to draw predators to a spot. Toss it near FND soldiers and let the local wildlife do the fighting, or use it to bring out animals while hunting.
C4
C4 is a remote-detonated explosive you place and trigger when the moment is right. It is your best tool for setting traps on roads, wiping out parked vehicles or blowing up a target without being nearby.
Dynamite
Dynamite is a timed explosive built for wrecking vehicles rather than soldiers on foot. Throw it under an armored car or tank and get clear before the fuse runs out.
EMP Grenade
The EMP Grenade shuts down vehicles, cameras and alarms in its blast. Throw one before you sneak into a base to blind its security, or stop a vehicle dead in its tracks.