Editing The Dark Woods (section)

=== Team vs. Team ===
If the two teams ever go on the same space, and either team wishes to fight, then the teams will directly engage each other in combat.  All of normal rules apply to this combat as with other encounters, except that the winning team does not gain an ability level from the encounter (because they are not able to drain the essence of the other PCs.)

If one team is smaller than the other, than the larger team must choose which of it's PCs will fight the smaller team, and they should choose the same number of PCs that the smaller team has.