Spinning and circling, going through each new opening. The second change is kinda tricky, I think you have to fake leaving the forest, see a path opening, and then run through it.
I can't say more than "follow the path in front of you, then turn back and follow the next path", cause there's nothing to it. You'll just move in circles.
If you can't make any progress, pm me your save file and I'll try to get you to Spinel.
