I think this quest is a load of crap.
Tried it in seven different circles - standing dead center to them. Used Toothpicks ability 4-6x on each one and got NOTHING. My time may not matter to Blizz, but it does to me.
I'm really tired of the buggy Shadowlands quests, have to check WoWhead to see what's what. If I can't tell if the quest is broke, I'm doing it wrong or it's another find 10 antelope horns if you kill 50-100 antelope you might get a drop, but this is not fun.
Toothpicks quest in Ardenweald was bad enough, this one in Revendreth is a major PiA.
EDIT: Left the area, dismissed Toothpick yada yada yada... Came back and took another stab at it, and finally started getting mites and anima canisters (in the overlapping rings someone had mentioned here).
Then was d/c'd from the game - came back to a quest complete. Go figure. Apparently Toothpick did some digging while I was reloading into the game.....