Drawing on your Kai skills you blend with the shadows and stand absolutely still. The Death Knight warrior appears, filling the archway with his massive frame. He snatches up the spear in his mailed fist, turns, and then hauls himself out of the ditch, grunting and cursing his carelessness as he struggles in his heavy armour.
You wait for about twenty minutes before leaving your hiding place and working your way along the ditch.