This is also known as the "One Two Punch" method. Place an IED (sticky bomb) where you are confident the Enforcer will walk towards. Use a Lure if needed. Then, take out the GL-94 grenade launcher (make sure you have about one to three rounds). When the Enforcer steps onto the IED, detonate it, then quickly blast the Enforcer in the chest or head to kill him. You can also use Proximity IEDs, but you can be more accurate with a regular IED.