Moving Through a Creature's Space

You can move through the space of a willing creature. If you want to move through an unwilling creature's space, you can Tumble Through it. You can't end your turn in a square occupied by another creature, though you can end a move action in its square provided that you immediately use another move action to leave that square. If two creatures end up in the same square by accident, the GM determines which one is forced out of the square (or whether one falls prone).