You don't need the skip for 5 mask run. Just go right instead, hug the obelisk to avoid pack with the big bug, kill pack of 4 small ones, cross water, kill another 4 small ones and you are next to free 200 sanity elite that will recoup you time spent on killing 2 packs before it. And the pack before Rexxar is needed to kill anyway to access the wind totem.