Just some GM meddling stuff here take it or leave it.
I like to subvert pc actions by making unintended consequences quite a bit, the healing realm is no different. Summer magic enhances the body's faculties for healing by speeding recovery to breakneck speeds... The energy for the body to do that has to come from somewhere... Healing regularly takes time and you probably don't even notice the drain it takes to heal, but doing the entire process in seconds? Some might argue that the magic itself is the power source, I'd say magic is the catalyst that allows the process to go this fast, I picture healing like building a wall of legos summer magic speeds your hand in placing those blocks but doesn't supply the blocks itself.
So for my games any evocation speed healing immediately removes a targeted consequence, bumps other and inflicts a consequence in the next slot of "suddenly exhausted". If there are no other slots open the consequence is still cleared and the character loses consciousness for the scene.
"suddenly exhausted" cannot be healed by magic, but can be healed by recovery powers.