In order to explain the uses of the pronoun SE we have to classify them in a group of verbs, in this case, the group of verbs of movement. According to the studies of Artículos sobre ELE- Página personal de E. Martín Peris which I do agree as well, this type of verbs explains the behavior of the verbs that use the pronoun SE.
Here, it is presented a possible treatment of verbs motion and stative. In this category, it is included both those who indicate movement as those which, without it, they are related to the body posture.
2) Verbs of motion and static (and other verbs associated semantically to them)