Question is based for some spells which can be cast in Other worlds for example "Call friend". It allow you to summon player which is not moved yet into your location (even Other world).
Does you first move from first to second area in Other world and then you can cast spell
or
you first cast spell then move
or
anyway player wish.
This can be important cause if you first move then cast spell you are prevented from summoning more than 1 player in Other world (cause when you are in 2nd area after move you will exit Other world)