I noticed something, intentional or not that you can use to avoid fighting old oak spirits when your doing the argent tournament daily quest Jack me some lumber.
1) If you have the daily quest, go to crystalsong forest.
2) Use lumberjacks axe on the crystalsong oak, just like the quests says
3) Just when the cast bar finishes quickly press feign death or if your not a hunter ANY other ability to drop aggro.