A Bloodrager with the Shapechanger bloodline gets a power at level 4 which reads:
"Spontaneous Change (Sp) At 4th level, when entering a bloodrage, you can cast a transmutation spell that affects only you as a swift action, provided that the spell’s normal casting time is 1 round or shorter. The spell lasts for as long as you continue bloodraging, regardless of the spell’s normal duration. You can use this ability only to cast bloodrager spells you know."
One transmutation spell on the Bloodrager spell list is Windy Escape:
" You respond to an attack by briefly becoming vaporous and insubstantial, allowing the attack to pass harmlessly through you.
You gain DR 10/magic against this attack and are immune to any poison, sneak attacks, or critical hit effect from that attack.
You cannot use windy escape against an attack of opportunity you provoked by casting a spell, using a spell-like ability, or using any other magical ability that provokes an attack of opportunity when used."
So my question is, does the interaction fail because of the wording of Windy Escape, or do you get the benefits of Windy Escape for the duration of your Bloodrage?
In arguments against it would clearly trivialize a lot of on level encounters as well as the wording of Windy Escape being quite restrictive in that you trigger it for an attack and it applies to that attack.
In arguments for it, the response to windy escape's wording is that if it were not worded to end then it would last forever like Masterwork Transformation since it is an instantaneous spell. The power itself does express that the original duration is unimportant which includes instantaneous duration spells, so it would devalue the class feature if that extra stipulation were added on.
The question then becomes, does the spell description alter to fit the class feature modifying the spell? Or is the class feature simply incompatible with the Spell because of the way the spell is worded?
I would appreciate any and all responses.