| Brunhin |
I realize this is an old thread, but there are some interactions I think that were missed.
First, I agree that if the spell is dismissed, there is no gradual turning back, it would be instantaneous (same as if any transmutation were dispelled). But there is another interaction you are missing that makes wind walk assaults impractical.
"Dismissable: If the duration line ends with “(D),” you can dismiss the spell at will. You must be within range of the spell's effect and must speak words of dismissal, which are usually a modified form of the spell's verbal component. If the spell has no verbal component, you can dismiss the effect with a gesture. Dismissing a spell is a standard action that does not provoke attacks of opportunity."
The second line says you must be within range of the spells effect to dismiss it. So if a spell has medium range you must be within that 100+10/lvl to dismiss an active spell.
Wind Walk, however, has a range of touch...Which means in order to dismiss the spell on a person other than yourself that you cast it on, they must be within reach so you can touch them as you dismiss the spell.
Your best bet if you wanted to make such an assault would be to fly in, have the cleric/druid turn back solid, then cast area dispel magic on the group, you can automatically succeed the check and the spell falls off.