In instances of having two Evokers in the party:
If 1ST casts Rescue on 2ND while 2ND is casting an empowered spell (Fire Breath, Spiritbloom, Dream Breath), that empowered spell will be canceled during the Rescue.
Rescue continues to work as intended for regular cast spells. I.E. If a Mage casts Fireball, I can Rescue them during the cast and it will continue and then complete as normal. Empowered spells need this same treatment.
Evokers are trying to be helpful–especially with the talent Twin Guardian–and it’s punishing players.
Side Note: I’ve yet to test this on an Earthen’s racial ability, but I suspect the same result.