Yancy nodded and desummoned her horse which collapsed into a pile of bones. Jon asked "Why'd you do that?" Yancy said "I already said magic doesn't work in the forest. It would have collapsed anyway. Even if it didn't, a horse is worse than useless climbing a mountain."
As Yancy entered the forest, Jon went off. The forest was full of creatures that never use magic but also never really act passive. One wrong move tot he wrong animal and it could be all over for everyone.
Yancy looked up and saw the Kuiper bug. The only docile creature in the forest. Unless provoked, the beetle will pay no mind to anything except for the sap on the trees.