Board Thread:General Discussion/@comment-4467206-20141030145027/@comment-25355646-20141031233401

Technically, Emma has been using light magic for a very long time: the lights flickered and turned off when she gave birth to Henry, Emma kissing Henry and breasking the curse, when Cora failed to rip out Emma's heart, using the dreamcatcher, creating the protection spell around Rumple's shop, stopping the Failsafe, creating the fire in Ariel and Dark Hollow​, helping Regina shade the moon, separating Rumple and Neal's bodies, levitating the broken bridge, using mirror magic to spy on Erica and Ariel, teleporting both the mug and Killian's hook, getting Zelena away from Henry, creating a protection spell at the hospital, and opening the time portal back to Storybrooke. So 4.01 is not the first time Emma's used light magic.