"Deploy a Spike Trap that works as a proximity mine, only detonating when an enemy gets close. This skill essentially combines the behavior of Caltrops and Grenades and gives the Demon Hunter an excellent way to guard the rear. Try leading enemies through doorways and place Spike Traps at the narrow opening. Similarly, place a series of Spike Traps more than 8 yards apart down the length of a narrow corridor, then lure enemies to chase after you to their doom."