This spell is a subtle illusion used to conceal a shugenja's trail from pursuers. The spell convinces mischievous Air kami to hide the tracks of the shugenja (and his mount, if any), along with any other evidence of his passage (such as broken branches). In their place it create a false trail of similar evidence leading in a completely different direction for the same distance. The illusionary trail will follow a reasonable route (e.g. it will not go straight up cliffs or directly into a lake, for example) and will normally be flawless to others' perception; however, someone tracking by scent will be able to sense the original trail, and skilled trackers can potentially see through the illusion by rolling Hunting / Perception against the caster's Spellcraft / Air.
Powerful shugenja can persuade the kami to conceal the trails of their companions (and mounts) as well as themselves, as well as lengthening the amount of trail which is concealed and replaced.