She can be only one sort of bird, a swift, bad at takeoff from the ground but tireless and quick in the air - and who needs to take off from the ground when the transformation leaves one six feet in the air from a standing start? It would be nearly as hard to add another creature to this spell's arsenal as it was to manage the swift in the first place. She is satisfied with the bird for now; she slips out of the palace and flies, invisible, for hours, and lets Thor tease her about the assignations that must have kept her up late and left her tired in the morning.
(She sometimes has assignations too, but fewer with the first blush of hormonal need worn away. Sometimes Sigyn, sometimes whoever else. Mostly: flying.)
A few months after she has begun to spend time as a bird (and picked up the idea of teleportation, which will be desperately difficult but not, she thinks, outside her reach) there is a parade. They have these every few decades, on the bicentennial or centennial anniversaries of things. The queen, the king, the princesses, a lot of neatly marching warriors, decorative performers with competent dance steps and pleasing voices and desperately incompetent illusions, all winding around in a slow trek around the capital city to be looked at and wave.
It is somehow even duller to sit in a parade and wave and smile when she could be being a bird.
But she can't, not really, so she sits, smiles, tries to remember without checking her notes what this is the twenty-seventh centennial of exactly, waves her hand at the crowd.
And then there's a crackling burst of light and Frigg, the king, her father, has collapsed from their vehicle to the street.
The smoking staff of power aimed at them is just barely visible in the distance among the crowd. Thor has already seized her hammer; Thor will handle that -
Loki leaps after her father, to duck another blast, to see the extent of the injury. "HEALER!" she cries. "IS THERE A HEALER?"
"YOUR KING REQUIRES HEALING! IF YOU HAVE ANY SKILL AT IT, STEP FORWARD!" Loki roars, checking her father's pulse. Be alive. Be alive while she collects her own courage or someone in the crowd collects their wits.
Fuck, fuck, fuck.
Odds of an 'invisible healer' gambit working -
Gaps in the crowd through which she could manifest an illusory one -
No and no.
Loki bends her head over her father and repairs him completely, and then leaps up, weapon in hand, and goes to help Thor.
(Back at the head of the parade, the king sits up in confusion, and the queen stares down from their vehicle in concern and surprise and growing anger.)
There will be time for Loki to deal with the queen's anger later. First she's going to trip the likely accomplice and pin her to the ground by the neck with a forked Lævateinn. "Put Mjolnir on her," she suggests in a low voice to her sister. "So she can be questioned."
"You've captured her well enough," says Thor, uncharacteristically serious and unhappy for having just been in a fight. "Is Father—?"
"He's alive. I am - expecting to be called away. I suppose I can leave Lævateinn."
Odin is glaring.
Frigg is getting to his feet, totally uninjured despite the large hole burned through his obviously-not-protective-enough enchanted clothing.
Thor... is confused.
She takes her hand off Lævateinn where it pins the assassin's accomplice, keeps her hands visible. Looks apologetically relieved at Frigg.
"Are the attackers caught?" calls Odin.
"Aye, Mother," Thor calls back.
Odin gives an order to some guards, who push through the crowd to surround the captured assassins. Out loud in her public-speaking voice, she says, "The attack has failed. The king is healed. We return to the palace. Come, Thor, Loki. Guards, bring the prisoners."
Thor... is still very confused. Some of the guards look at Loki with suspicion as they collect the prisoners, but no one interferes with her.
When the prisoners are transferred to non-Lævateinn-based methods of capture Loki retrieves her blade and puts it back in its carrying-around shape and comes as called.
Thor gets an approving nod from their mother when she arrives back at the vehicle. Loki gets summarily ignored. Thor darts a confused glance at her sister, but doesn't give voice to any actual questions on the way back to the palace.
Loki sits quietly and wonders just how bad an idea it would be to just fly far, far away -
"Loki," glowers Odin. "Have you anything to say for yourself?"
Does she have anything wise to say for herself?
"I decided a long time ago that I would rather he live and despise me than die not knowing he could have been saved, if ever it came to that."
"What...?" says Thor, and then seems unable to finish her sentence.
Frigg sighs. "Loki used magic to heal me of what would have been a mortal wound."
"...Sister...?" says Thor, conflictedly confused and unhappy.
"No one else stepped forward. I hadn't thought we were so short on lesser healers," murmurs Loki.
"The Tesseract taught me."
"Perhaps it was meant to be," says Frigg.
Odin growls louder.
"I don't understand," says Thor.
"When we were little," Loki tells Thor, "I went wandering through the palace and found a door that was meant to be locked, left open, and in it the Tesseract, which I did not know not to touch. And it taught me."
"It taught you sorcery? But - you're my sister. A princess of Asgard. Proper warriors don't do sorcery. But..." she looks at her father. "I..."