Revenants seem to come every 15 or so minutes for me, usually from the east, and when they do i just go hide in the side of the 'cross' looking thing on the mini-map and log off for 5 secs then back on. They wont target you anymore because they can't 'see you' if you're hiding in the right spot. Also while you're killing the demon, keep an eye out on the mini-map for extra yellow dots, who also seem to have a deliberate route. A.K.A, don't start going one way then turn back the other. I only use the two gaps on the west to kill them, as it gives more cover against the rev's if they come you can easily duck in the 'cross' bit and log out/back in, wait for them to move on and continue.