Is this due to moving inside? Casting while inside the spell stayed up until I entered that room.

[Manor House, Great Hall]
Long oak trestle tables with matching benches line the walls, ready to be pulled out for the manor's evening meal. Or so the hall was used in the days before the town's destruction. Now, sticky with filth and spilled ale, the tables are piled high with straw to form rude beds for the invaders. The rushes that cover the floor give off a sour smelling stench of mildew, mold and worse.
You also see a red bear orc reiver, a curving staircase and a splintered door.
Next move: north
Obvious exits: north, south, west.

>
Mapped exits: go splintered door, climb curving staircase

You reach out with your senses and see shimmering (9/21) streams of roiling Elemental mana coursing through the area.
Letting your senses extend further, you feel there is flickering (8/21) mana to the west, lambent (12/21) mana to the south, and flickering (8/21) mana to the north.
You sense the Tailwind spell upon you, which will last for about thirty-six roisaen.
You sense the Gauge Flow spell upon you, which will last for about eleven roisaen.
Roundtime: 4 sec.
R>
Learned: Attunement

The shifting winds blowing from behind you die down.



Moving down to Riverhaven...

> cast

You gesture.
The wind begins to shift until it blows gently from behind your back.

>
Learned: Augmentation, Elemental Magic, Attunement

> go shop

[Anthelorm's Gems and Curios, Purchasing Office]
Your first glance at this elegant shop is confusing. Instead of the expected cases and shelves of gleaming gemstones and expensive items, the room seems almost bare. Only one table can be seen and that is small and simple. On one wall is one small display case with only three items. The lady of the shop bustles up to you in a rustle of crisp silks and a whiff of something exotic and smiles delicately.
You also see a trash bin and Anthelorm.
Obvious exits: out.

>
You feel fully rested.
>
The shifting winds blowing from behind you die down.

Casting the spell while inside seems to work fine..but:

> per

You reach out with your senses and see shining (13/21) streams of roiling Elemental mana coursing through the area.
You sense the Tailwind spell upon you, which will last for about thirty-three roisaen.
Roundtime: 3 sec.
R>
Hanging on securely with three paws, the Taisidonian rat licks its fourth paw and spends several seconds carefully smoothing out the fur covering its lower back and one leg.
> out
You go out.

[Riverhaven, Ring Road West]
A small series of very elegant shops line the inner curve of the roadway. A jeweler and furrier seem to be the major attraction here. Several well-dressed ladies gaze wistfully at the expensive displays in the windows. Two prosperous-looking Dwarves talk in low guttural voices while examining a shipment of furs packed onto a small mule.
You also see the furrier's salon and the gem shop with a sign on it.
Obvious paths: north, south.

>
Mapped exits: go gem shop, go furrier's salon, go shed

>
The shifting winds blowing from behind you die down.