I also do this trick sometimes... It's a good way to farm odd powder to make magical flame. if you mob all the monster (just the blood infest) you can get about 1 slot + 20-30 pieces of odd powder... and to make 1 slot magical flame you need about 20 slots of odd powder (craft the odd powder into magic powder first).
you can keep farm there until about lv 85 and deleveled...