When there is a ledge nearby, run up to an enemy and press Triangle to get behind them. Quickly press Triangle again to throw them either behind or in front of you, depending on which way you aim the Analog-stick. If done correctly you can easily throw enemies over the ledge and automatically kill them. This attack works on all enemies except for shadow creatures, Thralls and Bosses. Of course, it also will not work when there are no big drops or if there are walls.