I had Recall and Preservation on me. Rather than dropping Preservation immediately after raising, one of the spells put back by Recall, strength, was dropped instead. Preservation didn't drop until its duration expired about 10 minutes after raining.

Strength had about 150 minutes to run at death.

...
upon the air and collides with your chest an instant before a brilliant flash suffuses you with raw spiritual energy.

Magical assistance is recalled to you as you feel the power of Lorminstra waxing!
You feel your extra strength departing.
SPJ>
You recall a piece of your own magic as the power of Lorminstra continues to wax within you...
A light blue glow surrounds you.
SPJ>

...
about 10 minutes later
...

You feel more refreshed.
>
You feel the preservation on your spirit fade.
>