RigaMortus
Explorer
A grease spell covers a solid surface with a layer of slippery grease. Any creature in the area when the spell is cast must make a successful Reflex save or fall. This save is repeated on your turn each round that the creature remains within the area. A creature can walk within or through the area of grease at half normal speed with a DC 10 Balance check. Failure means it can't move that round (and must then make a Reflex save or fall), while failure by 5 or more means it falls (see the Balance skill for details).
If a creature does not walk within or through the Greased area (in other words, they are standing in the Greased area, but remain in their 5' square), do they have to make the Balance check?